Check for a non-empty response from litelib_execute

src/mainwindow.cpp

@@ -246,7 +246,7 @@ MainWindow::MainWindow(QWidget *parent) :
             qDebug() << __func__ << ": caught an exception, ignoring: " << e.what();
         }
 
-        if (reply.toUpper().trimmed() != "OK") {
+        if (reply.isEmpty()) {
                 qDebug() << "Lite server " << config->server << " is down, getting a random one";
                 config->server = Settings::getRandomServer();
                 qDebug() << __func__ << ": new server is " << config->server;