status resp return null when only one ep

source/dnode/mgmt/node_mgmt/src/dmTransport.c

@@ -23,6 +23,10 @@ static inline void dmBuildMnodeRedirectRsp(SDnode *pDnode, SRpcMsg *pMsg) {
   SEpSet epSet = {0};
   dmGetMnodeEpSetForRedirect(&pDnode->data, pMsg, &epSet);
 
+  if (epSet.numOfEps == 1) {
+    return;
+  }
+
   const int32_t contLen = tSerializeSEpSet(NULL, 0, &epSet);
   pMsg->pCont = rpcMallocCont(contLen);
   if (pMsg->pCont == NULL) {