fix 批量删除

zhongzheng-system/src/main/java/com/zhongzheng/modules/grade/service/impl/ClassGradeUserServiceImpl.java

@@ -585,7 +585,6 @@ public class ClassGradeUserServiceImpl extends ServiceImpl<ClassGradeUserMapper,
             }else{
                 userPeriodExportVo.setStudyStatusTxt("已做题");
             }
-            userPeriodExportVo.setStudyStatusTxt("");
         }
         userPeriodExportVo.setScore(performance);