Filter out falsey platform configs

homeassistant/helpers/__init__.py

@@ -22,7 +22,10 @@ def config_per_platform(config: ConfigType,
     """
     for config_key in extract_domain_configs(config, domain):
         platform_config = config[config_key]
-        if not isinstance(platform_config, list):
+
+        if not platform_config:
+            continue
+        elif not isinstance(platform_config, list):
             platform_config = [platform_config]
 
         for item in platform_config:

tests/helpers/test_init.py

@@ -45,5 +45,4 @@ class TestHelpers(unittest.TestCase):
             ('hello', config['zone']),
             (None, 1),
             ('hello 2', config['zone Hallo'][1]),
-            (None, None)
         ] == list(helpers.config_per_platform(config, 'zone'))

tests/test_bootstrap.py

@@ -110,14 +110,6 @@ class TestBootstrap:
         loader.set_component(
             'platform_conf.whatever', MockPlatform('whatever'))
 
-        assert not bootstrap._setup_component(self.hass, 'platform_conf', {
-            'platform_conf': None
-        })
-
-        assert not bootstrap._setup_component(self.hass, 'platform_conf', {
-            'platform_conf': {}
-        })
-
         assert not bootstrap._setup_component(self.hass, 'platform_conf', {
             'platform_conf': {
                 'hello': 'world',
@@ -150,6 +142,8 @@ class TestBootstrap:
             }
         })
 
+        self.hass.config.components.remove('platform_conf')
+
         assert bootstrap._setup_component(self.hass, 'platform_conf', {
             'platform_conf': [{
                 'platform': 'whatever',
@@ -157,6 +151,19 @@ class TestBootstrap:
             }]
         })
 
+        self.hass.config.components.remove('platform_conf')
+
+        # Any falsey paltform config will be ignored (None, {}, etc)
+        assert bootstrap._setup_component(self.hass, 'platform_conf', {
+            'platform_conf': None
+        })
+
+        self.hass.config.components.remove('platform_conf')
+
+        assert bootstrap._setup_component(self.hass, 'platform_conf', {
+            'platform_conf': {}
+        })
+
     def test_component_not_found(self):
         """setup_component should not crash if component doesn't exist."""
         assert not bootstrap.setup_component(self.hass, 'non_existing')