Make sure empty get_events results is always a list (#72021)

homeassistant/components/logbook/__init__.py

@@ -271,7 +271,7 @@ async def ws_get_events(
         return
 
     if start_time > utc_now:
-        connection.send_result(msg["id"], {})
+        connection.send_result(msg["id"], [])
         return
 
     entity_ids = msg.get("entity_ids")

tests/components/logbook/test_init.py

@@ -2391,6 +2391,7 @@ async def test_get_events_future_start_time(hass, hass_ws_client, recorder_mock)
     assert response["id"] == 1
 
     results = response["result"]
+    assert isinstance(results, list)
     assert len(results) == 0