Do not sync entities with an empty name

homeassistant/components/google_assistant/smart_home.py

@@ -102,18 +102,23 @@ def sync_serialize(self):
         if state.state == STATE_UNAVAILABLE:
             return None
 
+        entity_config = self.config.entity_config.get(state.entity_id, {})
+        name = (entity_config.get(CONF_NAME) or state.name).strip()
+
+        # If an empty string
+        if not name:
+            return None
+
         traits = self.traits()
 
         # Found no supported traits for this entity
         if not traits:
             return None
 
-        entity_config = self.config.entity_config.get(state.entity_id, {})
-
         device = {
             'id': state.entity_id,
             'name': {
-                'name': entity_config.get(CONF_NAME) or state.name
+                'name': name
             },
             'attributes': {},
             'traits': [trait.name for trait in traits],

tests/components/google_assistant/test_smart_home.py

@@ -286,3 +286,29 @@ async def test_unavailable_state_doesnt_sync(hass):
             'devices': []
         }
     }
+
+
+async def test_empty_name_doesnt_sync(hass):
+    """Test that an entity with empty name does not sync over."""
+    light = DemoLight(
+        None, ' ',
+        state=False,
+    )
+    light.hass = hass
+    light.entity_id = 'light.demo_light'
+    await light.async_update_ha_state()
+
+    result = await sh.async_handle_message(hass, BASIC_CONFIG, {
+        "requestId": REQ_ID,
+        "inputs": [{
+            "intent": "action.devices.SYNC"
+        }]
+    })
+
+    assert result == {
+        'requestId': REQ_ID,
+        'payload': {
+            'agentUserId': 'test-agent',
+            'devices': []
+        }
+    }