fix cache

zhongzheng-system/src/main/java/com/zhongzheng/modules/schedule/service/impl/ScheduleServiceImpl.java

@@ -1942,6 +1942,9 @@ public class ScheduleServiceImpl extends ServiceImpl<PolyvVideoMapper, PolyvVide
                 LambdaQueryWrapper<MockMajorSubjectTime> lqw2 = Wrappers.lambdaQuery();
                 lqw2.eq(MockMajorSubjectTime::getId, subscribeVo.getEachExamId());
                 MockMajorSubjectTime mockMajorSubjectTime = iMockMajorSubjectTimeService.getOne(lqw2);
+                if(Validator.isEmpty(mockMajorSubjectTime)){
+                    continue;
+                }
                 LambdaQueryWrapper<MockMajorSubject> lqw3 = Wrappers.lambdaQuery();
                 lqw3.eq(MockMajorSubject::getMockMajorSubjectId, mockMajorSubjectTime.getMockMajorSubjectId());
                 MockMajorSubject mockMajorSubject = iMockMajorSubjectService.getOne(lqw3);