add 导出格式化时间

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

@@ -1839,8 +1839,8 @@ public class StudentRegistrationServiceImpl extends BaseServiceImpl<Long, Studen
         params.put("offset", pageInfo.getOffset());
         if (queryInfo.getPage() <= pageInfo.getTotalPage()) {
             RegisterDto registerOrPreMinTime = studentRegistrationDao.getRegisterOrPreMinTime(queryInfo.getMusicGroupId());
-            Date firstPreTime = registerOrPreMinTime.getMinPerRegisterTime();
-            Date firstPayTime = registerOrPreMinTime.getMinPayTime();
+            Date firstPreTime = registerOrPreMinTime != null ? registerOrPreMinTime.getMinPerRegisterTime() : null;
+            Date firstPayTime = registerOrPreMinTime != null ? registerOrPreMinTime.getMinPayTime() : null;
             dataList = studentRegistrationDao.getRegisterOrPreList(params);
             for (RegisterDto registerDto : dataList) {
                 if (registerDto.getPerRegisterTime() != null) {