Sisyphus.js don't save uncheckable radio buttons

script.js

(function($) {
  $(document).ready() {
    var $forms = $('form');
    $forms.find(':radio').change(function() {
      var sisyphus = Sisyphus.getInstance();
      var name = $(this).attr("name");
      var $form = $(this).parents('form');
      if (!$form.find(':radio[name="' + name + '"]:checked').length) {
        var prefix = (sisyphus.options.locationBased ? sisyphus.href : "") + $form.attr("id") + $form.attr("name") + name + sisyphus.options.customKeySuffix;
        sisyphus.saveToBrowserStorage(prefix, '', false);
      }
    });
    $forms.sisyphus();
  }
})(jQuery);