RMG: add error when downloading json file fails in CreateNetplaySessi…

…onDialog

Source/RMG/UserInterface/Dialog/Netplay/CreateNetplaySessionDialog.cpp

@@ -222,6 +222,7 @@ void CreateNetplaySessionDialog::on_networkAccessManager_Finished(QNetworkReply*
 {
     if (reply->error())
     {
+        this->showErrorMessage("Server Error", "Failed to retrieve server json list: " + reply->errorString());
         reply->deleteLater();
         return;
     }