feat：考级报名添加到订单备注

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

@@ -345,6 +345,10 @@ public class DegreeRegistrationServiceImpl extends BaseServiceImpl<Integer, Degr
             throw new BizException("订单更新失败");
         }
 
+        if(Objects.isNull(studentPaymentOrder.getClassGroupId())){
+            return true;
+        }
+
         if (degree == null || !degree.getStatus().equals(1)) {
             studentPaymentOrder.setMemo("订单状态已变更");
             studentPaymentOrder.setVersion(studentPaymentOrder.getVersion()+1);