retlehs/roots — pull request #577 by Foxaii (2012-10-15 19:45:05+00:00)
Title: Nav walker support for unset menu. 

Previous nav walker resulted in an error when no menu is set. This does not.
The fix supports supplementary classes for styling i.e. nav-header nav-header-blue.
N.B. Bootstrap classes (nav-header, divider, divider-vertical) must be added first.

See also: #551 #563