django-mptt/django-mptt — pull request #161 by carlospalol (2011-11-22 02:38:56+00:00)
Title: Removes empty label from TreeNodeMultipleChoiceField

Hi, the current TreeNodeMultipleChoiceField is showing an empty label if the field is not required.

![empty label screenshot](http://lab.awarepixel.com/static/ext/empty_label.png)