Show the last script error (if any)

def show_script_error(self, parent):
        """
        Show the last script error (if any)
        """
        if self.service.scriptRunner.error != '':
            dlg = Gtk.MessageDialog(type=Gtk.MessageType.INFO, buttons=Gtk.ButtonsType.OK,
                                     message_format=self.service.scriptRunner.error)
            self.service.scriptRunner.error = ''
            # revert the tray icon
            self.notifier.set_icon(cm.ConfigManager.SETTINGS[cm.NOTIFICATION_ICON])
            self.notifier.errorItem.hide()
            self.notifier.update_visible_status()

        else:
            dlg = Gtk.MessageDialog(type=Gtk.MessageType.INFO, buttons=Gtk.ButtonsType.OK,
                                     message_format=_("No error information available"))

        dlg.set_title(_("View script error"))
        dlg.set_transient_for(parent)
        dlg.run()
        dlg.destroy()