fix sms interface

xueyi-modules/xueyi-system/src/main/java/com/xueyi/system/staff/controller/api/DmVisitorInnerApiController.java

@@ -329,6 +329,8 @@ public class DmVisitorInnerApiController extends BaseApiController {
                 }
             }
 
+        } else {
+            return AjaxResult.error("请检查发送短信的配置").toJson();
         }
         return AjaxResult.success().toJson();
     }