fix:扣款繁忙

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

@@ -722,6 +722,9 @@ public class CourseScheduleStudentPaymentServiceImpl extends BaseServiceImpl<Lon
 		if(statusCoursesMap.containsKey(CourseStatusEnum.NOT_START)){
 			List<CourseScheduleStudentPaymentDto> notStartCourses = statusCoursesMap.get(CourseStatusEnum.NOT_START);
 			for (CourseScheduleStudentPaymentDto notStartCourse : notStartCourses) {
+				if(Objects.isNull(notStartCourse.getActualPrice())){
+					continue;
+				}
 				studentRegistrationService.updateUserSurplusCourseFee(notStartCourse.getUserId(), notStartCourse.getMusicGroupId(), notStartCourse.getActualPrice(), StringUtils.join("课程状态变更到未开始，退还缴费：", notStartCourse.getCourseScheduleId()), null);
 				notStartCourse.setActualPrice(BigDecimal.ZERO);
 				needUpdates.add(notStartCourse);