BTW `WFM::ClientExists()` won't help here as the wrapper is always installed in this case (yast2-country Requires yast2-packager),
we would need something like WFM::ModuleExists() here to check for Storage.ycp without any additional client, unfortunately it is missing...

To moving wrapper_storage to yast2.rpm - yes, might be a good idea, but in this case it won't change anything as yast2-packager is already Required. So I'd leave it as it is unless some other module (which does not Require yast2-packager already) needs it.