Handled empty hostname in server-del command
Fixes: https://fedorahosted.org/freeipa/ticket/6248
Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>