BS3 Modal. 2 scrollbars issue

Created by: woto

Hi, sorry for bad English. I want to tell that there is issue with opened modal (2 scrollbars) if javascripts included in head and not in the end of page as assumed in examples. The reason is here https://github.com/twbs/bootstrap/blob/3.0.0-wip/js/modal.js#L238 $body is empty