fix

cooleshow-user/user-biz/src/main/java/com/yonge/cooleshow/biz/dal/service/impl/CourseGroupServiceImpl.java

@@ -1317,6 +1317,9 @@ public class CourseGroupServiceImpl extends ServiceImpl<CourseGroupDao, CourseGr
     private void refund(CourseGroup courseGroup) {
         // 退款
         List<String> orderNoList = courseScheduleStudentPaymentService.getOrderNoByGroupId(courseGroup.getId());
+        if (CollectionUtils.isEmpty(orderNoList)) {
+            return;
+        }
         Collection<UserOrder> userOrders = userOrderService.listByIds(orderNoList);
         for (UserOrder order : userOrders) {
             try {