menu_get_item() doesn't set 'map' property in the item when access is denied

Truly, it is not just 'map' that is not set; 'page_arguments' and 'theme_arguments' are not even unserialize()'d.

if ($router_item['access']) {
  $router_item['map'] = $map;
  $router_item['page_arguments'] = array_merge(menu_unserialize($router_item['page_arguments'], $map), array_slice($map, $router_item['number_parts']));
  $router_item['theme_arguments'] = array_merge(menu_unserialize($router_item['theme_arguments'], $map), array_slice($map, $router_item['number_parts']));
}

It seems early optimization which could cause issues. Code that checks whether the currently logged user has access to the router item relies on $router_item['access'], not $router_item['map'].