Templating tricks with Smarty

Here are some tricks, using Smarty in the Campsite templates:

Check if the field is totally empty, i.e. no tags or whitespaces either:

{{ if trim(strip_tags($campsite->article->insert)) !== '' }}
                <ul class="articleList sidebar extLinks">
                    <li class="level-4 extLinks">
{{ $campsite->article->insert }}
                    </li>
               </ul>
{{ /if }}