cli: do not pass empty host-subject
cli: do not pass empty host-subject

Change-Id: I144a4ab4a01e74bdacc52991e707e7acd37fb2be
Signed-off-by: Michael Pasternak <af5566a40fc9757136fd9da9ca5e2dbdd9b039eb@redhat.com>

oVirt/ovirt-engine-cli,oVirt/ovirt-engine-cli