cli: do not consider None as valid option
cli: do not consider None as valid option

Change-Id: I7d4d48600d6e5f30d2cac28f6a22f6a8626b70a4
Signed-off-by: Michael pasternak <af5566a40fc9757136fd9da9ca5e2dbdd9b039eb@redhat.com>

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