mozilla/kuma — pull request #461 by darkwing (2012-07-27 16:59:56+00:00)
Title: fix bug 776586 - Prevent phantom HTML5 error when no hidden content

Duh.

Can test on the live site reported in the ticket by executing the following in the console:

$('#id_content').removeAttr("required");

And then submitting the empty content.