修改进行中乐团插入学生缴费，回调处理

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

@@ -66,6 +66,7 @@ public class ClassGroupTeacherMapperServiceImpl extends BaseServiceImpl<Long, Cl
         List<ClassGroupTeacherMapper> oldClassGroupTeacherMapper = classGroupTeacherMapperDao.getClassGroupTeacherMapper(classGroupTeacherMapperList);
 
         for (ClassGroup classGroup : classGroups) {
+            imGroupMemberList.clear();
             //原设置的老师删除群组
             for (ClassGroupTeacherMapper classGroupTeacherMapper : oldClassGroupTeacherMapper) {
                 if (!classGroup.getId().equals(classGroupTeacherMapper.getClassGroupId())) continue;