fix:作业改造旧版本兼容

mec-biz/src/main/java/com/ym/mec/biz/service/impl/TeacherAttendanceServiceImpl.java

@@ -295,11 +295,13 @@ public class TeacherAttendanceServiceImpl extends BaseServiceImpl<Long, TeacherA
 						}
 					}
 					courseHomework.setExpectNum(studentCourseHomeworks.size());
-					courseHomeworkService.update(courseHomework);
+					if(!CollectionUtils.isEmpty(studentCourseHomeworks)){
+						courseHomeworkService.update(courseHomework);
 
-					studentCourseHomeworkDao.batchInsertStudentCourseHomeworkRecord(studentCourseHomeworks);
-					List<Integer> studentIds = studentCourseHomeworks.stream().map(StudentCourseHomework::getUserId).collect(Collectors.toList());
-					studentServeService.updateExercisesSituation(courseSchedule.getClassDate(), studentIds, teacherAttendance.getTeacherId());
+						studentCourseHomeworkDao.batchInsertStudentCourseHomeworkRecord(studentCourseHomeworks);
+						List<Integer> studentIds = studentCourseHomeworks.stream().map(StudentCourseHomework::getUserId).collect(Collectors.toList());
+						studentServeService.updateExercisesSituation(courseSchedule.getClassDate(), studentIds, teacherAttendance.getTeacherId());
+					}
 				}else{
 					courseHomework.setContent(teacherSignOutDto.getCourseHomeworkInfo().getContent());
 					courseHomework.setAttachments(teacherSignOutDto.getCourseHomeworkInfo().getAttachments());