fix: test for callback existance before running it

src/aioappsrv/app.py

@@ -58,11 +58,9 @@ class AppService:
 				self.logger.warn("unhandled event of type %s, ignoring", event["type"])
 				continue
 			self.logger.debug("dispatching event %s for %s", event.type)
-			if event.type not in self._callbacks:
+			callback = self._callbacks.get(event.type, {}).get(event.room_id, None)
-				self._callbacks[event.type] = {}
+			if callback is not None:
-			asyncio.get_event_loop().create_task(
+				asyncio.get_event_loop().create_task(callback(event))
-				self._callbacks[event.type][event.room_id](event)
-			)
 			
 		return web.Response()
 
@@ -72,6 +70,8 @@ class AppService:
 				key = EventType[event]
 			else:
 				key = event
+			if event.type not in self._callbacks:
+				self._callbacks[event.type] = {}
 			self._callbacks[key][room] = func
 			return func
 		return wrapper