推送激活数据信息，判断绑定时间为空否

Util/Utils.cs

@@ -395,7 +395,8 @@ namespace MySystem
             string data = "{";
             data += "\"userId\":\"" + pos.BuyUserId + "\",";
             data += "\"brandId\":\"" + pos.BrandId + "\",";
-            data += "\"actTime\":\"" + pos.ActivationTime.Value.ToString("yyyy-MM-ddTHH:mm:ss") + "\",";
+            string actTime = pos.ActivationTime == null ? "" : pos.ActivationTime.Value.ToString("yyyy-MM-ddTHH:mm:ss");
+            data += "\"actTime\":\"" + actTime + "\",";
             data += "\"bindTime\":\"" + pos.BindingTime.Value.ToString("yyyy-MM-ddTHH:mm:ss") + "\",";
             data += "\"sn\":\"" + pos.PosSn + "\",";
             data += "\"actType\":\"" + actType + "\"";