fix: crash while set rpcinfo for db trans

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

@@ -708,9 +708,13 @@ int32_t mndSetRpcInfoForDbTrans(SMnode *pMnode, SRpcMsg *pMsg, EOperType oper, c
     if (pTrans->oper == oper) {
       if (strcasecmp(dbname, pTrans->dbname1) == 0) {
         mDebug("trans:%d, db:%s oper:%d matched with input", pTrans->id, dbname, oper);
-        if (taosArrayPush(pTrans->pRpcArray, &pMsg->info) != NULL) {
-          code = 0;
+        if (pTrans->pRpcArray == NULL) {
+          pTrans->pRpcArray = taosArrayInit(1, sizeof(SRpcHandleInfo));
+          if (pTrans->pRpcArray != NULL && taosArrayPush(pTrans->pRpcArray, &pMsg->info) != NULL) {
+            code = 0;
+          }
         }
+
         sdbRelease(pMnode->pSdb, pTrans);
         break;
       }