branch-4.0: [fix](catalog) Only sync storage vault when it exists #59113 (#59365)

Cherry-picked from #59113

Co-authored-by: walter <[email protected]>

Author: github-actions[bot]

fe/fe-core/src/main/java/org/apache/doris/cloud/catalog/CloudInstanceStatusChecker.java

@@ -87,6 +87,10 @@ private boolean isResponseValid(Cloud.GetInstanceResponse response) {
     }
 
     private void syncStorageVault(Cloud.InstanceInfoPB instance) {
+        if (instance.getStorageVaultNamesCount() == 0) {
+            return;
+        }
+
         Map<String, String> vaultMap = new HashMap<>();
         int cnt = instance.getResourceIdsCount();
         for (int i = 0; i < cnt; i++) {