Fix no data event triggers (#10049)

* Test including extra data on a no data trigger

* Match any dicts for default schema for event data

* Fix indentation

* Only check schema if one was configured

homeassistant/components/automation/event.py

@@ -21,7 +21,7 @@ _LOGGER = logging.getLogger(__name__)
 TRIGGER_SCHEMA = vol.Schema({
     vol.Required(CONF_PLATFORM): 'event',
     vol.Required(CONF_EVENT_TYPE): cv.string,
-    vol.Optional(CONF_EVENT_DATA, default={}): dict,
+    vol.Optional(CONF_EVENT_DATA): dict,
 })
 
 
@@ -31,11 +31,14 @@ def async_trigger(hass, config, action):
     event_type = config.get(CONF_EVENT_TYPE)
     event_data_schema = vol.Schema(
         config.get(CONF_EVENT_DATA),
-        extra=vol.ALLOW_EXTRA)
+        extra=vol.ALLOW_EXTRA) if CONF_EVENT_DATA in config else None
 
     @callback
     def handle_event(event):
         """Listen for events and calls the action when data matches."""
+        if event_data_schema:
+            # Check that the event data matches the configured
+            # schema if one was provided
             try:
                 event_data_schema(event.data)
             except vol.Invalid:

tests/components/automation/test_event.py

@@ -43,7 +43,7 @@ class TestAutomationEvent(unittest.TestCase):
             }
         })
 
-        self.hass.bus.fire('test_event')
+        self.hass.bus.fire('test_event', {'extra_key': 'extra_data'})
         self.hass.block_till_done()
         self.assertEqual(1, len(self.calls))