:zap: [Enhance] Remove unnecessary empty delta for NotImplemented message type

conversations/conversation_connector.py

@@ -102,7 +102,8 @@ class ConversationConnector:
                             for item in output:
                                 yield item
                         else:
-                            yield output
+                            if output:
+                                yield output
                     else:
                         message_parser.parse(data)
                 # Stream: List of all messages in the whole conversation

networks/message_parser.py

@@ -85,4 +85,4 @@ class MessageParser:
                         f"Not Supported Message Type: {message_type}"
                     )
 
-        return self.outputer.output(content="", content_type="NotImplemented")
+        return None