修改61活动学员排课次数

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

@@ -937,7 +937,7 @@ public class StudentManageServiceImpl implements StudentManageService {
             activityCourseDetailDto.setMusicTheoryPrice(BigDecimal.ZERO);
         }
         activityCourseDetailDto.setUserId(null);
-        student.setActivityCourseDetail(JSON.toJSONString(activityCourseDetailDto, SerializerFeature.WriteMapNullValue));
+        student.setActivityCourseDetail(JSON.toJSONString(activityCourseDetailDto));
         studentDao.update(student);
     }
 }