修复商户入库，联动身份证号为空的问题

AppStart/Helper/SycnSpServer/SycnSpMerchantService.cs

@@ -114,7 +114,7 @@ namespace MySystem
                                 add.MgrName = Mer.AgentName;
                                 add.MerStatus = 1;
                                 add.KqSnNo = Mer.SnNo;
-                                add.MerIdcardNo = Mer.MerIdcardNo.ToUpper();
+                                add.MerIdcardNo = function.CheckNull(Mer.MerIdcardNo).ToUpper();
                                 add.MerRealName = Mer.MerRealName;
                                 add.MerchantMobile = Mer.MerMobile;
                                 add.MerchantName = Mer.MerName;