REPORT-91742 fix: 补充下默认值

src/modules/pages/connection/list/list_item/list_item.ts

@@ -215,7 +215,7 @@ export class ListItem extends BI.BasicButton {
 
         if (BI.isNull(connection)) return;
 
-        const validationQuery = connection?.connectionData?.connectionPoolAttr?.validationQuery;
+        const validationQuery = connection?.connectionData?.connectionPoolAttr?.validationQuery || '';
 
         BI.set(connection, 'connectionData.connectionPoolAttr.validationQuery', api.getCipher(api.getPlain(validationQuery)));