server: Fail to bind object when requested version is 0

0 is not a valid version number for registry bind requests, so
let's check for it in registry_bind.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>