修复交易队列MerchantDepositRecord表AgentNo字段不能为空的问题

AppStart/Helper/SycnSpServer/SycnSpTradeService.cs

@@ -104,7 +104,7 @@ namespace MySystem
                                         MerNo = merchant.KqMerNo,
                                         DepositAmount = trade.TradeAmount,
                                         UserId = pos.BuyUserId,
-                                        AgentNo = merchant.MgrNo,
+                                        AgentNo = function.CheckNull(merchant.MgrNo),
                                         OrderId = DateTime.Now.ToString("yyyyMMddHHmmssfff") + function.get_Random(8),
                                     });
                                     db.SaveChanges();