bin: Do not fail vm start if it does not exist

Bug-Url: https://bugzilla.redhat.com/1055059
Related-To: https://bugzilla.redhat.com/1024710
Change-Id: I20148cddcd8299e91c37036406e15c50abeca925
Signed-off-by: Yedidyah Bar David <didi@redhat.com>