I was wondering if it would be possible to make a condition around a slot, to check if it is configured or not, and then display different markup.
Code example:
<isif condition="${The slot is configured}">
<isslot id="error-page-text-widget" context="folder" description="Error page text widget" context-object="${pdict.Widgets.contextFolder}" />
<iselse>
Other stuff
</isif>