修复查询报错

BBWYB.Server.Business/Order/OrderBusiness.cs

@@ -279,10 +279,13 @@ namespace BBWYB.Server.Business
                 #endregion
 
                 #region 处理采购单商家信息
-                var purchaserList = fsql.Select<Purchaser>(purchaserIdList).ToList();
-                foreach (var purchaseOrder in orderPurchaseInfoList)
+                if (purchaserIdList.Count() > 0)
                 {
-                    purchaseOrder.Purchaser = purchaserList.FirstOrDefault(p => p.Id == purchaseOrder.PurchaserId);
+                    var purchaserList = fsql.Select<Purchaser>(purchaserIdList).ToList();
+                    foreach (var purchaseOrder in orderPurchaseInfoList)
+                    {
+                        purchaseOrder.Purchaser = purchaserList.FirstOrDefault(p => p.Id == purchaseOrder.PurchaserId);
+                    }
                 }
                 #endregion