silverstripe/silverstripe-framework — pull request #2716 by gbonanome (2013-12-11 15:20:17+00:00)
Title: Fix empty $messageBlock on CheckboxField

From 2.4.13 the FormField Message attribute is Text, so every checkbox now show an empty $messageBlock.

See https://github.com/silverstripe/silverstripe-framework/issues/2489
or http://www.silverstripe.org/general-questions/show/25254