cakephp/cakephp — pull request #576 by challet (2012-03-21 19:08:33+00:00)
Title: FormHelper empty option for radio

Since radio buttons have basically the same behavior as a select list with single selection allowed,
an empty option could be useful, and some situation could require it.

In this purpose, some code has been added to the *FormHelper::radio* function, inspired from the *FormHelper::select* one. The difference here is that the default label become **'empty'** instead of **''**

In case you don't want to use this empty option, the behavior remains the same as before.