How can I determine, if pages has no output? Following code does not work

Code: Select all

<cms:pages masterpage='jobs.php'>
    <cms:show k_page_title/><br>
    <cms:set page_is_set="true" />
</cms:pages>
<cms:if page_is_set >
    There are pages viewed.
<cms:else />
    There are no pages viewed.
</cms:if>

[KK]

Please see viewtopic.php?f=4&t=9419#p20426

Thank you. I didn't found it in the docs or the forum.