diff --git a/homeassistant/bootstrap.py b/homeassistant/bootstrap.py
index 4d68227d4d0..41377aadebf 100644
--- a/homeassistant/bootstrap.py
+++ b/homeassistant/bootstrap.py
@@ -82,7 +82,7 @@ def _setup_component(hass, domain, config):
         return True
     component = loader.get_component(domain)
 
-    missing_deps = [dep for dep in component.DEPENDENCIES
+    missing_deps = [dep for dep in getattr(component, 'DEPENDENCIES', [])
                     if dep not in hass.config.components]
 
     if missing_deps:
@@ -106,7 +106,7 @@ def _setup_component(hass, domain, config):
 
     # Assumption: if a component does not depend on groups
     # it communicates with devices
-    if group.DOMAIN not in component.DEPENDENCIES:
+    if group.DOMAIN not in getattr(component, 'DEPENDENCIES', []):
         hass.pool.add_worker()
 
     hass.bus.fire(
@@ -133,14 +133,13 @@ def prepare_setup_platform(hass, config, domain, platform_name):
         return platform
 
     # Load dependencies
-    if hasattr(platform, 'DEPENDENCIES'):
-        for component in platform.DEPENDENCIES:
-            if not setup_component(hass, component, config):
-                _LOGGER.error(
-                    'Unable to prepare setup for platform %s because '
-                    'dependency %s could not be initialized', platform_path,
-                    component)
-                return None
+    for component in getattr(platform, 'DEPENDENCIES', []):
+        if not setup_component(hass, component, config):
+            _LOGGER.error(
+                'Unable to prepare setup for platform %s because '
+                'dependency %s could not be initialized', platform_path,
+                component)
+            return None
 
     if not _handle_requirements(hass, platform, platform_path):
         return None
diff --git a/homeassistant/components/alarm_control_panel/__init__.py b/homeassistant/components/alarm_control_panel/__init__.py
index d3289e08e62..3f5e6362fb6 100644
--- a/homeassistant/components/alarm_control_panel/__init__.py
+++ b/homeassistant/components/alarm_control_panel/__init__.py
@@ -15,7 +15,6 @@ from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.entity_component import EntityComponent
 
 DOMAIN = 'alarm_control_panel'
-DEPENDENCIES = []
 SCAN_INTERVAL = 30
 
 ENTITY_ID_FORMAT = DOMAIN + '.{}'
diff --git a/homeassistant/components/alarm_control_panel/manual.py b/homeassistant/components/alarm_control_panel/manual.py
index ca1816db9e6..63bc989f3df 100644
--- a/homeassistant/components/alarm_control_panel/manual.py
+++ b/homeassistant/components/alarm_control_panel/manual.py
@@ -18,8 +18,6 @@ from homeassistant.const import (
 
 _LOGGER = logging.getLogger(__name__)
 
-DEPENDENCIES = []
-
 DEFAULT_ALARM_NAME = 'HA Alarm'
 DEFAULT_PENDING_TIME = 60
 DEFAULT_TRIGGER_TIME = 120
diff --git a/homeassistant/components/arduino.py b/homeassistant/components/arduino.py
index 0c278ceee63..88967ec1f74 100644
--- a/homeassistant/components/arduino.py
+++ b/homeassistant/components/arduino.py
@@ -19,7 +19,6 @@ from homeassistant.const import (EVENT_HOMEASSISTANT_START,
                                  EVENT_HOMEASSISTANT_STOP)
 
 DOMAIN = "arduino"
-DEPENDENCIES = []
 REQUIREMENTS = ['PyMata==2.07a']
 BOARD = None
 _LOGGER = logging.getLogger(__name__)
diff --git a/homeassistant/components/binary_sensor/__init__.py b/homeassistant/components/binary_sensor/__init__.py
index 2ef9e83cc30..ccfd57aff8c 100644
--- a/homeassistant/components/binary_sensor/__init__.py
+++ b/homeassistant/components/binary_sensor/__init__.py
@@ -14,7 +14,6 @@ from homeassistant.helpers.entity import Entity
 from homeassistant.const import (STATE_ON, STATE_OFF)
 
 DOMAIN = 'binary_sensor'
-DEPENDENCIES = []
 SCAN_INTERVAL = 30
 
 ENTITY_ID_FORMAT = DOMAIN + '.{}'
diff --git a/homeassistant/components/browser.py b/homeassistant/components/browser.py
index db0f3710158..88548e2a1b3 100644
--- a/homeassistant/components/browser.py
+++ b/homeassistant/components/browser.py
@@ -8,7 +8,6 @@ https://home-assistant.io/components/browser/
 """
 
 DOMAIN = "browser"
-DEPENDENCIES = []
 
 SERVICE_BROWSE_URL = "browse_url"
 
diff --git a/homeassistant/components/configurator.py b/homeassistant/components/configurator.py
index 8bec580abf9..515daffc71c 100644
--- a/homeassistant/components/configurator.py
+++ b/homeassistant/components/configurator.py
@@ -15,7 +15,6 @@ from homeassistant.helpers import generate_entity_id
 from homeassistant.const import EVENT_TIME_CHANGED
 
 DOMAIN = "configurator"
-DEPENDENCIES = []
 ENTITY_ID_FORMAT = DOMAIN + ".{}"
 
 SERVICE_CONFIGURE = "configure"
diff --git a/homeassistant/components/conversation.py b/homeassistant/components/conversation.py
index d9cba832df7..7cd1193448c 100644
--- a/homeassistant/components/conversation.py
+++ b/homeassistant/components/conversation.py
@@ -14,7 +14,6 @@ from homeassistant.const import (
     ATTR_ENTITY_ID, SERVICE_TURN_ON, SERVICE_TURN_OFF)
 
 DOMAIN = "conversation"
-DEPENDENCIES = []
 
 SERVICE_PROCESS = "process"
 
diff --git a/homeassistant/components/discovery.py b/homeassistant/components/discovery.py
index 3a43c86f58a..807f1fe3944 100644
--- a/homeassistant/components/discovery.py
+++ b/homeassistant/components/discovery.py
@@ -17,7 +17,6 @@ from homeassistant.const import (
     ATTR_SERVICE, ATTR_DISCOVERED)
 
 DOMAIN = "discovery"
-DEPENDENCIES = []
 REQUIREMENTS = ['netdisco==0.5.1']
 
 SCAN_INTERVAL = 300  # seconds
diff --git a/homeassistant/components/downloader.py b/homeassistant/components/downloader.py
index a69a6ca1517..655bf7d4eb6 100644
--- a/homeassistant/components/downloader.py
+++ b/homeassistant/components/downloader.py
@@ -15,7 +15,6 @@ from homeassistant.helpers import validate_config
 from homeassistant.util import sanitize_filename
 
 DOMAIN = "downloader"
-DEPENDENCIES = []
 
 SERVICE_DOWNLOAD_FILE = "download_file"
 
diff --git a/homeassistant/components/group.py b/homeassistant/components/group.py
index 9ae83cb734a..52ffe824e42 100644
--- a/homeassistant/components/group.py
+++ b/homeassistant/components/group.py
@@ -17,7 +17,6 @@ from homeassistant.const import (
     STATE_UNKNOWN)
 
 DOMAIN = "group"
-DEPENDENCIES = []
 
 ENTITY_ID_FORMAT = DOMAIN + ".{}"
 
diff --git a/homeassistant/components/http.py b/homeassistant/components/http.py
index a7ae0c5af6e..88392ed3fe4 100644
--- a/homeassistant/components/http.py
+++ b/homeassistant/components/http.py
@@ -34,7 +34,6 @@ import homeassistant.util.dt as date_util
 import homeassistant.bootstrap as bootstrap
 
 DOMAIN = "http"
-DEPENDENCIES = []
 
 CONF_API_PASSWORD = "api_password"
 CONF_SERVER_HOST = "server_host"
diff --git a/homeassistant/components/ifttt.py b/homeassistant/components/ifttt.py
index da1b377b078..6f406b24311 100644
--- a/homeassistant/components/ifttt.py
+++ b/homeassistant/components/ifttt.py
@@ -22,8 +22,6 @@ ATTR_VALUE1 = 'value1'
 ATTR_VALUE2 = 'value2'
 ATTR_VALUE3 = 'value3'
 
-DEPENDENCIES = []
-
 REQUIREMENTS = ['pyfttt==0.3']
 
 
diff --git a/homeassistant/components/introduction.py b/homeassistant/components/introduction.py
index 08a71b27292..540d928f7f5 100644
--- a/homeassistant/components/introduction.py
+++ b/homeassistant/components/introduction.py
@@ -9,7 +9,6 @@ https://home-assistant.io/components/introduction/
 import logging
 
 DOMAIN = 'introduction'
-DEPENDENCIES = []
 
 
 def setup(hass, config=None):
diff --git a/homeassistant/components/isy994.py b/homeassistant/components/isy994.py
index 427ef4f048e..2a36f2060fc 100644
--- a/homeassistant/components/isy994.py
+++ b/homeassistant/components/isy994.py
@@ -20,7 +20,6 @@ from homeassistant.const import (
     ATTR_FRIENDLY_NAME)
 
 DOMAIN = "isy994"
-DEPENDENCIES = []
 REQUIREMENTS = ['PyISY==1.0.5']
 DISCOVER_LIGHTS = "isy994.lights"
 DISCOVER_SWITCHES = "isy994.switches"
diff --git a/homeassistant/components/keyboard.py b/homeassistant/components/keyboard.py
index ea650d8b421..c772d1c6e74 100644
--- a/homeassistant/components/keyboard.py
+++ b/homeassistant/components/keyboard.py
@@ -15,7 +15,6 @@ from homeassistant.const import (
 
 
 DOMAIN = "keyboard"
-DEPENDENCIES = []
 REQUIREMENTS = ['pyuserinput==0.1.9']
 
 
diff --git a/homeassistant/components/light/__init__.py b/homeassistant/components/light/__init__.py
index d7f8746de5a..1b80035fb0d 100644
--- a/homeassistant/components/light/__init__.py
+++ b/homeassistant/components/light/__init__.py
@@ -21,7 +21,6 @@ import homeassistant.util.color as color_util
 
 
 DOMAIN = "light"
-DEPENDENCIES = []
 SCAN_INTERVAL = 30
 
 GROUP_NAME_ALL_LIGHTS = 'all lights'
diff --git a/homeassistant/components/light/blinksticklight.py b/homeassistant/components/light/blinksticklight.py
index 5cc14a9034b..fae9890c93d 100644
--- a/homeassistant/components/light/blinksticklight.py
+++ b/homeassistant/components/light/blinksticklight.py
@@ -14,7 +14,6 @@ _LOGGER = logging.getLogger(__name__)
 
 
 REQUIREMENTS = ["blinkstick==1.1.7"]
-DEPENDENCIES = []
 
 
 # pylint: disable=unused-argument
diff --git a/homeassistant/components/lock/__init__.py b/homeassistant/components/lock/__init__.py
index 2cbd3a40872..fdc2da3e8d4 100644
--- a/homeassistant/components/lock/__init__.py
+++ b/homeassistant/components/lock/__init__.py
@@ -20,7 +20,6 @@ from homeassistant.const import (
 from homeassistant.components import (group, wink)
 
 DOMAIN = 'lock'
-DEPENDENCIES = []
 SCAN_INTERVAL = 30
 
 GROUP_NAME_ALL_LOCKS = 'all locks'
diff --git a/homeassistant/components/logger.py b/homeassistant/components/logger.py
index a6dafa56005..9a5d1c59d1a 100644
--- a/homeassistant/components/logger.py
+++ b/homeassistant/components/logger.py
@@ -10,7 +10,6 @@ import logging
 from collections import OrderedDict
 
 DOMAIN = 'logger'
-DEPENDENCIES = []
 
 LOGSEVERITY = {
     'CRITICAL': 50,
diff --git a/homeassistant/components/media_player/__init__.py b/homeassistant/components/media_player/__init__.py
index 8140bbb2af9..8204052b4a9 100644
--- a/homeassistant/components/media_player/__init__.py
+++ b/homeassistant/components/media_player/__init__.py
@@ -22,7 +22,6 @@ from homeassistant.const import (
     SERVICE_MEDIA_NEXT_TRACK, SERVICE_MEDIA_PREVIOUS_TRACK, SERVICE_MEDIA_SEEK)
 
 DOMAIN = 'media_player'
-DEPENDENCIES = []
 SCAN_INTERVAL = 10
 
 ENTITY_ID_FORMAT = DOMAIN + '.{}'
diff --git a/homeassistant/components/modbus.py b/homeassistant/components/modbus.py
index 099801eb7cf..6f53c89835a 100644
--- a/homeassistant/components/modbus.py
+++ b/homeassistant/components/modbus.py
@@ -13,7 +13,6 @@ from homeassistant.const import (EVENT_HOMEASSISTANT_START,
 
 DOMAIN = "modbus"
 
-DEPENDENCIES = []
 REQUIREMENTS = ['https://github.com/bashwork/pymodbus/archive/'
                 'd7fc4f1cc975631e0a9011390e8017f64b612661.zip#pymodbus==1.2.0']
 
diff --git a/homeassistant/components/mqtt/__init__.py b/homeassistant/components/mqtt/__init__.py
index 65db49f8636..0e8506523d2 100644
--- a/homeassistant/components/mqtt/__init__.py
+++ b/homeassistant/components/mqtt/__init__.py
@@ -33,7 +33,6 @@ DEFAULT_RETAIN = False
 SERVICE_PUBLISH = 'publish'
 EVENT_MQTT_MESSAGE_RECEIVED = 'MQTT_MESSAGE_RECEIVED'
 
-DEPENDENCIES = []
 REQUIREMENTS = ['paho-mqtt==1.1', 'jsonpath-rw==1.4.0']
 
 CONF_BROKER = 'broker'
diff --git a/homeassistant/components/notify/__init__.py b/homeassistant/components/notify/__init__.py
index 6cd7a2196cf..9182f1dbf3a 100644
--- a/homeassistant/components/notify/__init__.py
+++ b/homeassistant/components/notify/__init__.py
@@ -17,7 +17,6 @@ from homeassistant.helpers import config_per_platform
 from homeassistant.const import CONF_NAME
 
 DOMAIN = "notify"
-DEPENDENCIES = []
 
 # Title of notification
 ATTR_TITLE = "title"
diff --git a/homeassistant/components/recorder.py b/homeassistant/components/recorder.py
index f654f035857..acda166e12a 100644
--- a/homeassistant/components/recorder.py
+++ b/homeassistant/components/recorder.py
@@ -23,7 +23,6 @@ from homeassistant.const import (
     EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP)
 
 DOMAIN = "recorder"
-DEPENDENCIES = []
 
 DB_FILE = 'home-assistant.db'
 
diff --git a/homeassistant/components/rfxtrx.py b/homeassistant/components/rfxtrx.py
index 38aa785e7ad..aea3afe7f05 100644
--- a/homeassistant/components/rfxtrx.py
+++ b/homeassistant/components/rfxtrx.py
@@ -9,7 +9,6 @@ https://home-assistant.io/components/rfxtrx/
 import logging
 from homeassistant.util import slugify
 
-DEPENDENCIES = []
 REQUIREMENTS = ['https://github.com/Danielhiversen/pyRFXtrx/archive/0.2.zip' +
                 '#RFXtrx==0.2']
 
diff --git a/homeassistant/components/script.py b/homeassistant/components/script.py
index 2b18a5143fd..f8240bbf7f5 100644
--- a/homeassistant/components/script.py
+++ b/homeassistant/components/script.py
@@ -76,8 +76,9 @@ def setup(hass, config):
             _LOGGER.warn("Found invalid key for script: %s. Use %s instead.",
                          object_id, slugify(object_id))
             continue
-        if not cfg.get(CONF_SEQUENCE):
-            _LOGGER.warn("Missing key 'sequence' for script %s", object_id)
+        if not isinstance(cfg.get(CONF_SEQUENCE), list):
+            _LOGGER.warn("Key 'sequence' for script %s should be a list",
+                         object_id)
             continue
         alias = cfg.get(CONF_ALIAS, object_id)
         script = Script(hass, object_id, alias, cfg[CONF_SEQUENCE])
diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index 32ee59a6fa9..95cb331b91f 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -12,7 +12,6 @@ from homeassistant.helpers.entity_component import EntityComponent
 from homeassistant.components import wink, zwave, isy994, verisure
 
 DOMAIN = 'sensor'
-DEPENDENCIES = []
 SCAN_INTERVAL = 30
 
 ENTITY_ID_FORMAT = DOMAIN + '.{}'
diff --git a/homeassistant/components/shell_command.py b/homeassistant/components/shell_command.py
index 61c9add3f23..5e12c8bfd6e 100644
--- a/homeassistant/components/shell_command.py
+++ b/homeassistant/components/shell_command.py
@@ -12,7 +12,6 @@ import subprocess
 from homeassistant.util import slugify
 
 DOMAIN = 'shell_command'
-DEPENDENCIES = []
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/homeassistant/components/sun.py b/homeassistant/components/sun.py
index a5b83e76929..efe0a7dec2b 100644
--- a/homeassistant/components/sun.py
+++ b/homeassistant/components/sun.py
@@ -15,7 +15,6 @@ import homeassistant.util.dt as dt_util
 from homeassistant.helpers.event import track_point_in_utc_time
 from homeassistant.helpers.entity import Entity
 
-DEPENDENCIES = []
 REQUIREMENTS = ['astral==0.8.1']
 DOMAIN = "sun"
 ENTITY_ID = "sun.sun"
diff --git a/homeassistant/components/switch/__init__.py b/homeassistant/components/switch/__init__.py
index 9a0abb4ce7a..e7b3c629f39 100644
--- a/homeassistant/components/switch/__init__.py
+++ b/homeassistant/components/switch/__init__.py
@@ -20,7 +20,6 @@ from homeassistant.components import (
     group, discovery, wink, isy994, verisure, zwave)
 
 DOMAIN = 'switch'
-DEPENDENCIES = []
 SCAN_INTERVAL = 30
 
 GROUP_NAME_ALL_SWITCHES = 'all switches'
diff --git a/homeassistant/components/thermostat/__init__.py b/homeassistant/components/thermostat/__init__.py
index 480e3e4805e..b475fce39d8 100644
--- a/homeassistant/components/thermostat/__init__.py
+++ b/homeassistant/components/thermostat/__init__.py
@@ -20,7 +20,6 @@ from homeassistant.const import (
     TEMP_CELCIUS)
 
 DOMAIN = "thermostat"
-DEPENDENCIES = []
 
 ENTITY_ID_FORMAT = DOMAIN + ".{}"
 SCAN_INTERVAL = 60
diff --git a/homeassistant/components/updater.py b/homeassistant/components/updater.py
index 803cfa609ca..a020a6c0abb 100644
--- a/homeassistant/components/updater.py
+++ b/homeassistant/components/updater.py
@@ -16,7 +16,6 @@ from homeassistant.helpers import event
 
 _LOGGER = logging.getLogger(__name__)
 PYPI_URL = 'https://pypi.python.org/pypi/homeassistant/json'
-DEPENDENCIES = []
 DOMAIN = 'updater'
 ENTITY_ID = 'updater.updater'
 
diff --git a/homeassistant/components/wink.py b/homeassistant/components/wink.py
index bd79210bf75..1ab82236596 100644
--- a/homeassistant/components/wink.py
+++ b/homeassistant/components/wink.py
@@ -17,7 +17,6 @@ from homeassistant.const import (
     ATTR_SERVICE, ATTR_DISCOVERED, ATTR_FRIENDLY_NAME)
 
 DOMAIN = "wink"
-DEPENDENCIES = []
 REQUIREMENTS = ['https://github.com/balloob/python-wink/archive/'
                 '42fdcfa721b1bc583688e3592d8427f4c13ba6d9.zip'
                 '#python-wink==0.2']
diff --git a/homeassistant/components/zone.py b/homeassistant/components/zone.py
index a32a297caeb..da0341129f7 100644
--- a/homeassistant/components/zone.py
+++ b/homeassistant/components/zone.py
@@ -15,7 +15,6 @@ from homeassistant.helpers.entity import Entity
 from homeassistant.util.location import distance
 
 DOMAIN = "zone"
-DEPENDENCIES = []
 ENTITY_ID_FORMAT = 'zone.{}'
 ENTITY_ID_HOME = ENTITY_ID_FORMAT.format('home')
 STATE = 'zoning'
diff --git a/homeassistant/components/zwave.py b/homeassistant/components/zwave.py
index e21c339fb23..b52e430600a 100644
--- a/homeassistant/components/zwave.py
+++ b/homeassistant/components/zwave.py
@@ -17,7 +17,6 @@ from homeassistant.const import (
     EVENT_PLATFORM_DISCOVERED, ATTR_SERVICE, ATTR_DISCOVERED)
 
 DOMAIN = "zwave"
-DEPENDENCIES = []
 REQUIREMENTS = ['pydispatcher==2.0.5']
 
 CONF_USB_STICK_PATH = "usb_path"
diff --git a/homeassistant/loader.py b/homeassistant/loader.py
index b05083b4abd..8b38f5e0966 100644
--- a/homeassistant/loader.py
+++ b/homeassistant/loader.py
@@ -193,7 +193,7 @@ def _load_order_component(comp_name, load_order, loading):
 
     loading.add(comp_name)
 
-    for dependency in component.DEPENDENCIES:
+    for dependency in getattr(component, 'DEPENDENCIES', []):
         # Check not already loaded
         if dependency in load_order:
             continue
diff --git a/tests/components/test_script.py b/tests/components/test_script.py
index 50cfba55ec5..30b7e4e3c8f 100644
--- a/tests/components/test_script.py
+++ b/tests/components/test_script.py
@@ -27,23 +27,10 @@ class TestScript(unittest.TestCase):
         """ Stop down stuff we started. """
         self.hass.stop()
 
-    def test_setup_with_empty_sequence(self):
-        self.assertTrue(script.setup(self.hass, {
-            'script': {
-                'test': {
-                    'sequence': []
-                }
-            }
-        }))
-
-        self.assertIsNone(self.hass.states.get(ENTITY_ID))
-
     def test_setup_with_missing_sequence(self):
         self.assertTrue(script.setup(self.hass, {
             'script': {
-                'test': {
-                    'sequence': []
-                }
+                'test': {}
             }
         }))
 
@@ -60,6 +47,19 @@ class TestScript(unittest.TestCase):
 
         self.assertEqual(0, len(self.hass.states.entity_ids('script')))
 
+    def test_setup_with_dict_as_sequence(self):
+        self.assertTrue(script.setup(self.hass, {
+            'script': {
+                'test': {
+                    'sequence': {
+                        'event': 'test_event'
+                    }
+                }
+            }
+        }))
+
+        self.assertEqual(0, len(self.hass.states.entity_ids('script')))
+
     def test_firing_event(self):
         event = 'test_event'
         calls = []