feat：乐团改造

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

@@ -1428,6 +1428,10 @@ public class StudentRegistrationServiceImpl extends BaseServiceImpl<Long, Studen
             throw new BizException("学员注册信息不存在");
         }
 
+        if(StudentMusicGroupStatusEnum.QUIT.equals(studentRegistration.getMusicGroupStatus())){
+            return BigDecimal.ZERO;
+        }
+
         if(BigDecimal.ZERO.compareTo(amount)>0&&amount.abs().compareTo(studentRegistration.getSurplusCourseFee())>0){
             amount = studentRegistration.getSurplusCourseFee().negate();
         }