增加分润逻辑

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

@@ -507,6 +507,9 @@ public class StudentRegistrationServiceImpl extends BaseServiceImpl<Long, Studen
     @Transactional(rollbackFor = Exception.class)
     public StudentRegistration queryByUserIdAndMusicGroupId(Integer userId, String musicGroupId) {
         StudentRegistration registration = studentRegistrationDao.queryByUserIdAndMusicGroupId(userId, musicGroupId);
+        if(registration == null){
+            return null;
+        }
         SysUserCashAccount account = sysUserCashAccountDao.getLocked(userId);
         registration.setBalance(account.getBalance());
         registration.setTransferStudent(registration.getTemporaryCourseFee() == null ? 0 : 1);