cakephp/cakephp — pull request #1207 by renansaddam (2013-03-29 14:26:10+00:00)
Title: Fixing tag generation for Html::script() and Html::css() when using 'fullBase' => true

Changing values on array_diff_key() from empty ('') to null as they have no consequences and offer better readability, as noted by ADmad.