WooCommerce - product_category shortcode with author_id

<?php
  // Does what the standard WooCommerce product_catgeory shortcode does
  // but also takes an author parameter, ie the author id
  // example: [product_category category="kits" author="2"]
  // code goes in functions.php for your child theme

  add_shortcode('custom_product_category', 'custom_product_category');
  function custom_product_category( $atts ) {
    global $woocommerce_loop;

    $atts = shortcode_atts( array(
      'per_page' => '12',
      'columns'  => '4',
      'orderby'  => 'title',
      'order'    => 'desc',
      'category' => '',  // Slugs
      'operator' => 'IN', // Possible values are 'IN', 'NOT IN', 'AND'.
      'author' => '' // defaults to all authors
    ), $atts );

    if ( ! $atts['category'] ) {
      return '';
    }

    // Default ordering args
    $ordering_args = WC()->query->get_catalog_ordering_args( $atts['orderby'], $atts['order'] );
    $meta_query    = WC()->query->get_meta_query();

    $args = array(
      'post_type'       => 'product',
      'author'          => $atts['author'],
      'post_status'     => 'publish',
      'ignore_sticky_posts'  => 1,
      'orderby'         => $ordering_args['orderby'],
      'order'           => $ordering_args['order'],
      'posts_per_page'  => $atts['per_page'],
      'meta_query'      => $meta_query,
      'tax_query'       => array(
        array(
          'taxonomy'    => 'product_cat',
          'terms'       => array_map( 'sanitize_title', explode( ',', $atts['category'] ) ),
          'field'       => 'slug',
          'operator'    => $atts['operator']
        ),
      )
    );

    if ( isset( $ordering_args['meta_key'] ) ) {
      $args['meta_key'] = $ordering_args['meta_key'];
    }

    ob_start();

    $products = new WP_Query( apply_filters( 'woocommerce_shortcode_products_query', $args, $atts ) );

    $columns = absint( $atts['columns'] );
    $woocommerce_loop['columns'] = $columns;

    if ( $products->have_posts() ) : ?>

      <?php do_action( 'woocommerce_shortcode_before_product_cat_loop' ); ?>

      <?php woocommerce_product_loop_start(); ?>

        <?php while ( $products->have_posts() ) : $products->the_post(); ?>

          <?php wc_get_template_part( 'content', 'product' ); ?>

        <?php endwhile; // end of the loop. ?>

      <?php woocommerce_product_loop_end(); ?>

      <?php do_action( 'woocommerce_shortcode_after_product_cat_loop' ); ?>

    <?php endif;

    woocommerce_reset_loop();
    wp_reset_postdata();

    $return = '<div class="woocommerce columns-' . $columns . '">' . ob_get_clean() . '</div>';

    // Remove ordering query arguments
    WC()->query->remove_ordering_args();

    return $return;
  }