Fix wrong message when using pw -V with a non existent directory
Add a regression test about it

PR:		194971
Submitted by:	Freddy DISSAUX <bugzilla@dsx.bsdsx.fr>


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274453 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f