Comment 4 for bug 1444229

Submitter: Robert Lyon (<email address hidden>)
Branch: 15.04_STABLE

commit c40435fa4ed1fd9a43c419024b8615d1c724e69b
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