twitter/bootstrap — pull request #1861 by pamelafox (2012-02-09 06:10:51+00:00)
Title: Fix for tooltips made from empty title string

If you create a tooltip from an element with an empty title attribute (	), the code will error on line 209 with "Cannot call method toString from undefined". That's because 'data-original-attribute' is an empty string at that point, which evaluates to false, and it doesn't find a title in options. I put in a simple fix but you could put in a better one.