Merge branch '3.0' of https://github.com/taosdata/TDengine into refact/code_format

source/dnode/mnode/impl/src/mndMnode.c

@@ -239,7 +239,9 @@ void mndGetMnodeEpSet(SMnode *pMnode, SEpSet *pEpSet) {
         pEpSet->inUse = (pEpSet->numOfEps + 1) % totalMnodes;
       }
     }
-    addEpIntoEpSet(pEpSet, pObj->pDnode->fqdn, pObj->pDnode->port);
+    if (pObj->pDnode != NULL) {
+      addEpIntoEpSet(pEpSet, pObj->pDnode->fqdn, pObj->pDnode->port);
+    }
     sdbRelease(pSdb, pObj);
   }