Ticket #8350: 8350.diff

wp-includes/taxonomy.php

@@ -2078 +2078 @@
         global $wpdb;
 
         // This function only works for post categories.
-        if ( 'category' != $taxonomy )
+        if ( !is_taxonomy_hierarchical( $taxonomy ) )
                 return;
 
         $term_hier = _get_term_hierarchy($taxonomy);