Fluid Tipp 11: Fallback für Variablen-Zuweisung

<!-- Giving variables default values if they are NULL -->
{class -> f:or(alternative: 'my-default') -> f:variable(name: 'class')}
{label -> f:or(alternative: 'werkraum') -> f:variable(name: 'label')}
{body -> f:or(alternative: 'Body not set') -> f:variable(name: 'body')}

<!-- Purpose: guarantee a value is filled for mandatory output -->
<div class="{class}">
  <h4>{label}</h4>
  <f:format.html>{body}</f:format.html>
</div>

<!--
Works well when your fields *must* always be output but don't necessarily
have a value, e.g. are TCA fields with no requirement for a value.
-->