Fix case where machine_options is not specified (#561)
Fix case where machine_options is not specified (#561)

* fix the case where machine_options is not specified - this is a valid case if using aws_launch_configuration (fixes the issue @saieva identied on #chef-provisioning)

Signed-off-by: Jaymz Julian <b8eb3a843423d6c5f0e756be7258b3cbc61da9d7@limepoint.com>

chef/chef-provisioning-aws,chef/chef-provisioning-aws