diff --git a/homeassistant/components/frontend/version.py b/homeassistant/components/frontend/version.py
index 5f27f606cb8..93ae4032b56 100644
--- a/homeassistant/components/frontend/version.py
+++ b/homeassistant/components/frontend/version.py
@@ -1,2 +1,2 @@
 """DO NOT MODIFY. Auto-generated by build_frontend script."""
-VERSION = "4062ab87999fd5e382074ba9d7a880d7"
+VERSION = "c2932592a6946e955ddc46f31409b81f"
diff --git a/homeassistant/components/frontend/www_static/frontend.html b/homeassistant/components/frontend/www_static/frontend.html
index 8a6c2285480..799ecae4a09 100644
--- a/homeassistant/components/frontend/www_static/frontend.html
+++ b/homeassistant/components/frontend/www_static/frontend.html
@@ -3658,7 +3658,7 @@ e.bindAnimationForKeyframeEffect(this)),(this.effect instanceof window.SequenceE
     text-transform: capitalize;
     line-height: 40px;
     margin-left: 16px;
-  }</style><template><state-badge state-obj="[[stateObj]]" in-dialog="[[inDialog]]"></state-badge><a href="[[stateObj.entityDisplay]]" target="_blank" class="name" id="link">[[stateObj.entityDisplay]]</a></template></dom-module><dom-module id="ha-entities-card" assetpath="cards/"><style is="custom-style" include="iron-flex"></style><style>.states {
+  }</style><template><state-badge state-obj="[[stateObj]]" in-dialog="[[inDialog]]"></state-badge><a href="[[stateObj.state]]" target="_blank" class="name" id="link">[[stateObj.entityDisplay]]</a></template></dom-module><dom-module id="ha-entities-card" assetpath="cards/"><style is="custom-style" include="iron-flex"></style><style>.states {
       padding-bottom: 16px;
     }
     .state {
diff --git a/homeassistant/components/frontend/www_static/home-assistant-polymer b/homeassistant/components/frontend/www_static/home-assistant-polymer
index 89a1723f9f5..ac311416a99 160000
--- a/homeassistant/components/frontend/www_static/home-assistant-polymer
+++ b/homeassistant/components/frontend/www_static/home-assistant-polymer
@@ -1 +1 @@
-Subproject commit 89a1723f9f5fdaf5b144222b82b73995200ed339
+Subproject commit ac311416a99f41abbe98142ccac5f84f77d88296
diff --git a/homeassistant/components/group.py b/homeassistant/components/group.py
index aade1493c0b..c289cca42c5 100644
--- a/homeassistant/components/group.py
+++ b/homeassistant/components/group.py
@@ -39,7 +39,7 @@ def _conf_preprocess(value):
     return value
 
 _SINGLE_GROUP_CONFIG = vol.Schema(vol.All(_conf_preprocess, {
-    vol.Required(CONF_ENTITIES): cv.entity_ids,
+    vol.Optional(CONF_ENTITIES): vol.Any(None, cv.entity_ids),
     CONF_VIEW: bool,
     CONF_NAME: str,
     CONF_ICON: cv.icon,
@@ -145,7 +145,7 @@ def setup(hass, config):
     """Setup all groups found definded in the configuration."""
     for object_id, conf in config.get(DOMAIN, {}).items():
         name = conf.get(CONF_NAME, object_id)
-        entity_ids = conf[CONF_ENTITIES]
+        entity_ids = conf.get(CONF_ENTITIES) or []
         icon = conf.get(CONF_ICON)
         view = conf.get(CONF_VIEW)
 
diff --git a/homeassistant/components/light/__init__.py b/homeassistant/components/light/__init__.py
index c8b108003b7..f78e1dbdcba 100644
--- a/homeassistant/components/light/__init__.py
+++ b/homeassistant/components/light/__init__.py
@@ -92,8 +92,8 @@ LIGHT_TURN_ON_SCHEMA = vol.Schema({
     ATTR_XY_COLOR: vol.All(vol.ExactSequence((cv.small_float, cv.small_float)),
                            vol.Coerce(tuple)),
     ATTR_COLOR_TEMP: vol.All(int, vol.Range(min=154, max=500)),
-    ATTR_FLASH: [FLASH_SHORT, FLASH_LONG],
-    ATTR_EFFECT: [EFFECT_COLORLOOP, EFFECT_RANDOM, EFFECT_WHITE],
+    ATTR_FLASH: vol.In([FLASH_SHORT, FLASH_LONG]),
+    ATTR_EFFECT: vol.In([EFFECT_COLORLOOP, EFFECT_RANDOM, EFFECT_WHITE]),
 })
 
 LIGHT_TURN_OFF_SCHEMA = vol.Schema({
diff --git a/homeassistant/components/mqtt/__init__.py b/homeassistant/components/mqtt/__init__.py
index ae932f26ff6..510aedb00e2 100644
--- a/homeassistant/components/mqtt/__init__.py
+++ b/homeassistant/components/mqtt/__init__.py
@@ -90,7 +90,7 @@ CONFIG_SCHEMA = vol.Schema({
         vol.Optional(CONF_PASSWORD): cv.string,
         vol.Optional(CONF_CERTIFICATE): cv.isfile,
         vol.Optional(CONF_PROTOCOL, default=DEFAULT_PROTOCOL):
-            [PROTOCOL_31, PROTOCOL_311],
+            vol.All(cv.string, vol.In([PROTOCOL_31, PROTOCOL_311])),
         vol.Optional(CONF_EMBEDDED): _HBMQTT_CONFIG_SCHEMA,
     }),
 }, extra=vol.ALLOW_EXTRA)
diff --git a/homeassistant/components/rfxtrx.py b/homeassistant/components/rfxtrx.py
index c0e88785685..610350a7e63 100644
--- a/homeassistant/components/rfxtrx.py
+++ b/homeassistant/components/rfxtrx.py
@@ -65,7 +65,7 @@ CONFIG_SCHEMA = vol.Schema({
         vol.Optional(ATTR_DEBUG, default=False): cv.boolean,
         vol.Optional(ATTR_DUMMY, default=False): cv.boolean,
     }),
-})
+}, extra=vol.ALLOW_EXTRA)
 
 
 def setup(hass, config):
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 2356a90ba91..9bb3d3fba7a 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -1,7 +1,7 @@
 # coding: utf-8
 """Constants used by Home Assistant components."""
 
-__version__ = "0.17.0"
+__version__ = "0.17.1"
 REQUIRED_PYTHON_VER = (3, 4)
 
 PLATFORM_FORMAT = '{}.{}'
diff --git a/script/home-assistant@.service b/script/home-assistant@.service
index 9c4876f9789..a36a6e743b1 100644
--- a/script/home-assistant@.service
+++ b/script/home-assistant@.service
@@ -1,5 +1,7 @@
 # This is a simple service file for systems with systemd to tun HA as user.
 #
+# For details please check https://home-assistant.io/getting-started/autostart/
+#
 [Unit]
 Description=Home Assistant for %i
 After=network.target
@@ -9,6 +11,7 @@ Type=simple
 User=%i
 # Enable the following line if you get network-related HA errors during boot
 #ExecStartPre=/usr/bin/sleep 60
+# Use `whereis hass` to determine the path of hass
 ExecStart=/usr/bin/hass
 SendSIGKILL=no
 
diff --git a/tests/components/mqtt/test_init.py b/tests/components/mqtt/test_init.py
index c83f8380913..4c5f14bf0f1 100644
--- a/tests/components/mqtt/test_init.py
+++ b/tests/components/mqtt/test_init.py
@@ -58,6 +58,17 @@ class TestMQTT(unittest.TestCase):
                 }
             })
 
+    def test_setup_protocol_validation(self):
+        """Test for setup failure if connection to broker is missing."""
+        with mock.patch('paho.mqtt.client.Client'):
+            self.hass.config.components = []
+            assert _setup_component(self.hass, mqtt.DOMAIN, {
+                mqtt.DOMAIN: {
+                    mqtt.CONF_BROKER: 'test-broker',
+                    mqtt.CONF_PROTOCOL: 3.1,
+                }
+            })
+
     def test_publish_calls_service(self):
         """Test the publishing of call to services."""
         self.hass.bus.listen_once(EVENT_CALL_SERVICE, self.record_calls)
diff --git a/tests/components/test_group.py b/tests/components/test_group.py
index 8526be9768d..5c23d6ca0cd 100644
--- a/tests/components/test_group.py
+++ b/tests/components/test_group.py
@@ -226,6 +226,7 @@ class TestComponentsGroup(unittest.TestCase):
                         'view': True,
                     },
                     'test_group': 'hello.world,sensor.happy',
+                    'empty_group': {'name': 'Empty Group', 'entities': None},
                 }
             })