public function getStaticContents($force = false) : CNabuSiteStaticContentList
    {
        if (!$this->isBuiltIn() &&
            ($this->nb_site_static_content_list->isEmpty() || $force)
        ) {
            $this->nb_site_static_content_list = CNabuSiteStaticContent::getStaticContentsForSite($this);
            $this->nb_site_static_content_list->sort();
        }

        return $this->nb_site_static_content_list;
    }