Comment 2 for bug 1444229

Reviewed: https://reviews.mahara.org/4621
Committed: http://gitorious.org/mahara/mahara/commit/29053d1b096b03bf0adfc0820a2150461312f168
Submitter: Aaron Wells (<email address hidden>)
Branch: master

commit 29053d1b096b03bf0adfc0820a2150461312f168
Author: Aaron Wells <email address hidden>
Date: Wed Apr 15 14:38:22 2015 +1200

Explicitly tell the template to use the AJAX block loader

Bug 1444229: It was hacky to rely on the block content being empty
to signal the AJAX block loader. We should tell it to do so explicitly.

Change-Id: I9816c43c96ffed85282ac0d874fa5bfe1ca62e00