Empty string passed to getElementById() in dropdown.js

Created by: devsnd

I am Using Firefox 22.

Reproduce:

• Open http://getbootstrap.com/components/
• The error is visible in the console when clicking anywhere in the page but a dropdown menu.

I could track down the error to the clearMenus call, which in turn calls getParents where the error finally happens.

In getParents the selector variable is set to '#'. This character is stripped away inside jQuery.