Support yard stats for objects with no file property.
Support yard stats for objects with no file property.

Fixes #792

lsegal/yard,jreinert/yard,ohai/yard,amclain/yard,thomthom/yard,herosky/yard,alexdowad/yard,iankronquist/yard,thomthom/yard,thomthom/yard,ohai/yard,alexdowad/yard,alexdowad/yard,amclain/yard,herosky/yard,lsegal/yard,iankronquist/yard,jreinert/yard,amclain/yard,jreinert/yard,ohai/yard,herosky/yard,lsegal/yard,iankronquist/yard