Merge branch 'master-jdk21' of https://gitee.com/zhijiantianya/ruoyi-vue-pro

# Conflicts:
#	yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/candidate/expression/BpmTaskAssignStartUserExpression.java
#	yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/service/oa/BpmOALeaveServiceImpl.java

yudao-module-system/yudao-module-system-biz/src/main/java/cn/iocoder/yudao/module/system/controller/admin/auth/AuthController.java

@@ -99,7 +99,7 @@ public class AuthController {
         // 1.1 获得用户信息
         AdminUserDO user = userService.getUser(getLoginUserId());
         if (user == null) {
-            return null;
+            return success(null);
         }
 
         // 1.2 获得角色列表