[WOOCOMMERCE] Show empty categories

functions.php

<?php
// WooCommerce Code
// Show empty categories
// https://gist.github.com/renegadesk/3926139
// https://gist.github.com/dalemoore
add_filter('woocommerce_product_subcategories_args', 'woocommerce_show_empty_categories');
function woocommerce_show_empty_categories( $cat_args ){
    $cat_args[ 'hide_empty' ] = 0;
    return $cat_args;
}