Handle broadcasts to zero clients

miguelgrinberg · miguelgrinberg · commit af0004d78edd · 2017-03-27T20:00:16.000-07:00
Fixes miguelgrinberg#88
diff --git a/socketio/asyncio_manager.py b/socketio/asyncio_manager.py
@@ -23,7 +23,8 @@ async def emit(self, event, data, namespace, room=None, skip_sid=None,
                     id = None
                 tasks.append(self.server._emit_internal(sid, event, data,
                                                         namespace, id))
-        await asyncio.wait(tasks)
+        if tasks != []:
+            await asyncio.wait(tasks)
 
     async def close_room(self, room, namespace):
         """Remove all participants from a room.
