Update controllers/ws_controller.py

controllers/ws_controller.py

@@ -206,7 +206,7 @@ async def websocket_main(code: str,  websocket: WebSocket,brand_name: Optional[s
 async def send_message_in_chunks(websocket: WebSocket, message_json: dict, chunk_size: int):
     attchment_len = 0
     body_len = 0
-    if message_json['attachments'] not None :
+    if message_json['attachments'] is not None :
         for attch in message_json['attachments']:
             attacment_len = attch['attachment_len']
             body_len = attch['body_len']