Merge pull request #4436 from taosdata/feature/wal

TD-2299

src/dnode/src/dnodePeer.c

@@ -182,6 +182,8 @@ void dnodeSendMsgToDnode(SRpcEpSet *epSet, SRpcMsg *rpcMsg) {
 void dnodeSendMsgToMnodeRecv(SRpcMsg *rpcMsg, SRpcMsg *rpcRsp) {
   SRpcEpSet epSet = {0};
   dnodeGetEpSetForPeer(&epSet);
+
+  assert(tsClientRpc != 0);
   rpcSendRecv(tsClientRpc, &epSet, rpcMsg, rpcRsp);
 }