修复查询报错

BBWYB.Server.Business/Order/OrderBusiness.cs

@@ -265,7 +265,7 @@ namespace BBWYB.Server.Business
 
                 #region 处理采购信息
                 var orderPurchaseInfoList = fsql.Select<OrderPurchaseInfo>().Where(op => orderIdList.Contains(op.OrderId) && op.IsEnabled == true).ToList<OrderPurchaseInfoResponse>();
-                var purchaserIdList = orderPurchaseInfoList.Select(opi => opi.PurchaserId).Distinct().ToList();
+                var purchaserIdList = orderPurchaseInfoList.Where(opi=>!string.IsNullOrEmpty(opi.PurchaserId)).Select(opi => opi.PurchaserId).Distinct().ToList();
                 var orderPurchaseSkuInfoList = fsql.Select<OrderPurchaseSkuInfo>().Where(o => orderIdList.Contains(o.OrderId)).ToList<OrderPurchaseSkuInfoResponse>();
                 foreach (var order in orderList)
                 {