refactor, clean up useless code.

lichao

2021-06-01 365c864a587365fe443b11cc0cd7cfc8f8f8eb81

 box/center_topic_node.cpp

@@ -106,7 +106,7 @@
         *reply.mutable_errmsg() = data.errmsg();
         reply.set_data(ToJson(data));
      } else {
         SetError(*reply.mutable_errmsg(), eInvalidInput, "not supported topic" + request.topic());
         SetError(*reply.mutable_errmsg(), eInvalidInput, "invalid topic: " + request.topic());
      }
      pnode_->ServerSendReply(src_info, reply);
   };