修复查询报错

BBWYB.Server.Business/Order/OrderBusiness.cs

@@ -279,11 +279,14 @@ namespace BBWYB.Server.Business
                 #endregion
 
                 #region 处理采购单商家信息
+                if (purchaserIdList.Count() > 0)
+                {
                     var purchaserList = fsql.Select<Purchaser>(purchaserIdList).ToList();
                     foreach (var purchaseOrder in orderPurchaseInfoList)
                     {
                         purchaseOrder.Purchaser = purchaserList.FirstOrDefault(p => p.Id == purchaseOrder.PurchaserId);
                     }
+                }
                 #endregion
 
                 #region 处理SKU