Remove empty col-sm-4 and extend col-sm-8 with col-sm-12

(function ($, Drupal, window, document, undefined) {
  // Bootstrap Remove empty cols in rows.
  Drupal.behaviors.removeEmptyCols = {
    attach: function (context, settings) {

      // Remove empty col-sm-4 and extend col-sm-8 with col-sm-12.
      // You will need to add the parent class . like node-teaser to limit the each function.
      $(".row").each(function() {
        if ($(this).children('.col-sm-4').html().trim().length === 0) {
          $(this).children('.col-sm-8').addClass('col-sm-12');
          $(this).children('.col-sm-12').removeClass('col-sm-8');
          $(this).children('.col-sm-4').remove();
        }
      });

    }
  }
})(jQuery, Drupal, this, this.document);