Be more explicit that setupCertificates does nothing if the dir does not exist
Be more explicit that setupCertificates does nothing if the dir does not exist

… instead of relying on ReadDir returning an empty list on failure.

Signed-off-by: Miloslav Trmač <9c008e38982a5397deb855345fb164f0558459ae@redhat.com>

masters-of-cats/image,containers/image,containers/image