WooCommerce 3.1 - leere Kategorien

//show emtpy cat
    add_filter( 'woocommerce_product_subcategories_hide_empty', 'show_empty_categories', 10, 1 );
function show_empty_categories ( $show_empty ) {
    $show_empty  =  true;
    // You can add other logic here too
    return $show_empty;
}

//show empty categories
add_filter( 'woocommerce_product_subcategories_hide_empty', '__return_false', 10, 1 );
function show_empty_categories ( $show_empty ) {
    $show_empty  =  true;
    // You can add other logic here too
    return $show_empty;
}