Modification to sell_media_load_template

gistfile1.txt

/**
 * Loads a template from a specified path
 *
 * @package Ajax
 * @uses load_template()
 * @since 0.1
 */
function sell_media_load_template() {

    if ( file_exists( get_template_directory() . '/cart.php' ) ) {
        $file_path = get_template_directory() . '/cart.php';
    } else {
        $file_path = SELL_MEDIA_PLUGIN_DIR . '/themes/cart.php';
    }
    load_template( $file_path );
    die();
}
add_action( 'wp_ajax_nopriv_sell_media_load_template', 'sell_media_load_template' );
add_action( 'wp_ajax_sell_media_load_template', 'sell_media_load_template' );