[Feature#]修正查询用户信息未指定年级时查询结果为空的 Bug

src/main/java/com/steadon/saber/service/impl/UserGroupServiceImpl.java

@@ -60,7 +60,11 @@ public class UserGroupServiceImpl implements UserGroupService {
     @Override
     public PageData<UserInfo> searchUserInfo(UserInfoSearchRequest request, Integer pageNo, Integer pageSize) {
         String keyword = request.getKeyword();
-        QueryWrapper<UserInfo> wrapper = new QueryWrapper<UserInfo>().eq("grade", request.getGrade()).and(w -> w.like("name", keyword).or().like("email", keyword).or().like("mobile", keyword).or().like("user_id", keyword));
+        QueryWrapper<UserInfo> wrapper = new QueryWrapper<UserInfo>().and(w -> w.like("name", keyword).or().like("email", keyword).or().like("mobile", keyword).or().like("user_id", keyword));
+        // 区分筛选条件是否有年级
+        if (request.getGrade() != null && request.getGrade().length() != 0){
+            wrapper.eq("grade", request.getGrade());
+        }
         Page<UserInfo> page = new Page<>(pageNo, pageSize);
         Page<UserInfo> pageData = userInfoMapper.selectPage(page, wrapper);
         return new PageData<UserInfo>().praiseIPage(pageData);