Empty submenu generated if it has no visible items

Nice Menus module generate empty submenu, when submenu has invisible items (e.g. for "views" or "Image styles" items).

It is simple to fix this problem. Add to nicemenus.module, line 569, theme_nice_menus_build function:

     // ................
      if ($trail && in_array($mlid, $trail)) {
        $class .= ' active-trail';
      }
			
      // ------------ added
      if ($has_below = !empty($menu_item['below'])) {
            foreach ($menu_item['below'] as $below_item) {
                  $has_below = $below_item['link']['hidden'] == 0;
                  if ($has_below) {
                        break;
                  }
            }
      }
      // ------------ added
			
      // If it has children build a nice little tree under it.
      // Build a nice little tree under it if it has children, and has been set
      // to expand (when that option is being respected).
      if ((!empty($menu_item['link']['has_children'])) &&
          ($has_below) && $depth != 0 &&  // <-- changed from:  (!empty($menu_item['below'])) && $depth != 0 &&
          ($respect_expanded == 0 || $menu_item['link']['expanded'])) {
      // ......