Fix load of components without any config from packages (#9901)

* Fix load of components without any config from packages

- Add 'None' to the packages config schema validation, to be able to
load components without any more configuration from yaml package files,
like `wake_on_lan`, `media_extractor` and so on.

* test the ability to load components without configuration from packages

homeassistant/config.py

@@ -123,7 +123,7 @@ http_password: welcome
 
 PACKAGES_CONFIG_SCHEMA = vol.Schema({
     cv.slug: vol.Schema(  # Package names are slugs
-        {cv.slug: vol.Any(dict, list)})  # Only slugs for component names
+        {cv.slug: vol.Any(dict, list, None)})  # Only slugs for component names
 })
 
 CUSTOMIZE_CONFIG_SCHEMA = vol.Schema({

tests/test_config.py

@@ -442,6 +442,38 @@ class TestConfig(unittest.TestCase):
         assert self.hass.config.units.name == CONF_UNIT_SYSTEM_METRIC
         assert self.hass.config.time_zone.zone == 'America/New_York'
 
+    def test_loading_configuration_from_packages(self):
+        """Test loading packages config onto hass object config."""
+        self.hass.config = mock.Mock()
+
+        run_coroutine_threadsafe(
+            config_util.async_process_ha_core_config(self.hass, {
+                'latitude': 39,
+                'longitude': -1,
+                'elevation': 500,
+                'name': 'Huis',
+                CONF_TEMPERATURE_UNIT: 'C',
+                'time_zone': 'Europe/Madrid',
+                'packages': {
+                    'package_1': {'wake_on_lan': None},
+                    'package_2': {'light': {'platform': 'hue'},
+                                  'media_extractor': None,
+                                  'sun': None}},
+            }), self.hass.loop).result()
+
+        # Empty packages not allowed
+        with pytest.raises(MultipleInvalid):
+            run_coroutine_threadsafe(
+                config_util.async_process_ha_core_config(self.hass, {
+                    'latitude': 39,
+                    'longitude': -1,
+                    'elevation': 500,
+                    'name': 'Huis',
+                    CONF_TEMPERATURE_UNIT: 'C',
+                    'time_zone': 'Europe/Madrid',
+                    'packages': {'empty_package': None},
+                }), self.hass.loop).result()
+
     @mock.patch('homeassistant.util.location.detect_location_info',
                 autospec=True, return_value=location_util.LocationInfo(
                     '0.0.0.0', 'US', 'United States', 'CA', 'California',
@@ -541,6 +573,7 @@ def test_merge(merge_log_err):
         'pack_11': {'input_select': {'is1': None}},
         'pack_list': {'light': {'platform': 'test'}},
         'pack_list2': {'light': [{'platform': 'test'}]},
+        'pack_none': {'wake_on_lan': None},
     }
     config = {
         config_util.CONF_CORE: {config_util.CONF_PACKAGES: packages},
@@ -550,10 +583,11 @@ def test_merge(merge_log_err):
     config_util.merge_packages_config(config, packages)
 
     assert merge_log_err.call_count == 0
-    assert len(config) == 4
+    assert len(config) == 5
     assert len(config['input_boolean']) == 2
     assert len(config['input_select']) == 1
     assert len(config['light']) == 3
+    assert config['wake_on_lan'] is None
 
 
 def test_merge_new(merge_log_err):