fix: sql command 'show create stable' error

source/libs/catalog/src/ctgAsync.c

@@ -1082,7 +1082,7 @@ _return:
     ctgReleaseVgInfoToCache(pCtg, dbCache);
   }
 
-  if (pTask->res) {
+  if (pTask->res || code) {
     ctgHandleTaskEnd(pTask, code);
   }
   

source/libs/nodes/src/nodesUtilFuncs.c

@@ -392,6 +392,9 @@ static void destroyDataSinkNode(SDataSinkNode* pNode) { nodesDestroyNode((SNode*
 static void destroyExprNode(SExprNode* pExpr) { taosArrayDestroy(pExpr->pAssociation); }
 
 static void destroyTableCfg(STableCfg* pCfg) {
+  if (NULL == pCfg) {
+    return;
+  }
   taosArrayDestroy(pCfg->pFuncs);
   taosMemoryFree(pCfg->pComment);
   taosMemoryFree(pCfg->pSchemas);