function genesis_post_categories_shortcode( $atts ) {

  if ( ! is_object_in_taxonomy( get_post_type(), 'category' ) ) {
    return '';
  }

  $defaults = [
    'sep'    => ', ',
    'before' => __( 'Filed Under: ', 'genesis' ),
    'after'  => '',
  ];

  $atts = shortcode_atts( $defaults, $atts, 'post_categories' );

  $cats = get_the_category_list( trim( $atts['sep'] ) . ' ' );

  // Do nothing if there are no categories.
  if ( ! $cats ) {
    return '';
  }

  $output = sprintf( '<span %s>', genesis_attr( 'entry-categories' ) ) . $atts['before'] . $cats . $atts['after'] . '</span>';

  return apply_filters( 'genesis_post_categories_shortcode', $output, $atts );

}