修复管理后台用户名不对登陆null的问题

yshop-admin/src/main/java/co/yixiang/modules/system/service/impl/SysUserServiceImpl.java

@@ -9,6 +9,7 @@
 package co.yixiang.modules.system.service.impl;
 
 import cn.hutool.core.date.DateUtil;
+import co.yixiang.api.YshopException;
 import co.yixiang.common.service.impl.BaseServiceImpl;
 import co.yixiang.common.utils.QueryHelpPlus;
 import co.yixiang.dozer.service.IGenerator;
@@ -142,6 +143,8 @@ public class SysUserServiceImpl extends BaseServiceImpl<SysUserMapper, User> imp
     @Override
     public UserDto findByName(String userName) {
         User user = userMapper.findByName(userName);
+
+        if(user == null) throw new YshopException("当前用户不存在");
         //用户所属岗位
         user.setJob(jobService.getById(user.getJobId()));
         //用户所属部门