fix: set response code for empty rpcMsg

src/client/src/tscServer.c

@@ -663,6 +663,9 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg, SRpcEpSet *pEpSet) {
         memcpy(pRes->pRsp, rpcMsg->pCont, pRes->rspLen);
       }
     } else {
+      if (pRes->code == TSDB_CODE_SUCCESS) {
+        pRes->code = TSDB_CODE_RPC_UNEXPECTED_RESPONSE;
+      }
       tfree(pRes->pRsp);
     }