No default value for pass by ref. Props filosofo. fixes #13553

git-svn-id: http://svn.automattic.com/wordpress/trunk@14945 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/nav-menu-template.php

@@ -296,7 +296,7 @@ function wp_nav_menu( $args = array() ) {
  *
  * @param array $menu_items The current menu item objects to which to add the class property information.
  */
-function _wp_menu_item_classes_by_context( &$menu_items = array() ) {
+function _wp_menu_item_classes_by_context( &$menu_items ) {
 	global $wp_query;
 
 	$queried_object = $wp_query->get_queried_object();