fix shiftcode为null

Src/Dlhis.Canteen/Order/Services/Implements/OrderService.cs

@@ -474,6 +474,7 @@ public class OrderService : BaseOrderService, IOrderService
               .Where(x => x.Status == BalanceRecordStatusEnumType.Valid)
               .Where(x => x.OrderStatus == CanteenOrderStatusEnumType.Success)
               .Where(x => x.ApplicationType == CanteenApplicaitonTypeEnumType.Device)
+              .Where(x => SqlFunc.IsNullOrEmpty(x.BusinessShiftCode))
               .WhereIF(outRequest.No.IsPresent(), x => x.No == outRequest.No)
               .ToListAsync();