Check if editor field is empty?

The CMS Questions
1

Is it possible to check if an editor field is empty? The normal isEmpty() does not work:

<?php if ($page->offerSum()->isEmpty()):?>Shop<?php else: ?>Offer<?php endif; ?>

2

You should be able to do this:

 <?php if ($page->offerSum()->blocks()->isEmpty()):?>Shop<?php else: ?>Offer<?php endif; ?>