修改bug：添加查询舱单时的菜单列表权限数据的null值验证

Myshipping.Application/Service/BookingOrder/BookingOrderService.cs

@@ -223,7 +223,7 @@ namespace Myshipping.Application
             }
             //获取菜单列表权限
             List<long> userlist = await _right.GetDataScopeList(MenuConst.MenuBookingOrder);
-            List<string> userlistString = userlist.Select(u => u.ToString()).ToList();
+            List<string> userlistString = userlist?.Select(u => u.ToString())?.ToList();
             List<long?> pidlist = new List<long?>();
             if (!string.IsNullOrWhiteSpace(input.SEALNO) || !string.IsNullOrWhiteSpace(input.CNTRNO))
             {