Empty taxonomy / category redirects to subtaxonomy / subcategory

HI!

Found out someone was asking for this, and yet again Topic was closed! People, do not close topics when they are not solved.

Here is a solution, add following code to “wp” action in your plugin / theme:

if (is_tax("MY_TAXONOMY_NAME")) {
    if ($term = get_term_by("slug", get_query_var("term"), "MY_TAXONOMY_NAME")) {
        if (!$term->count &&
            $subterms = get_terms("MY_TAXONOMY_NAME", array("parent" => $term->term_id)))
        {
            wp_redirect(get_term_link($subterms[0], "MY_TAXONOMY_NAME"));
            exit;
        }
    }
}