By default `.get()` will return `None` on a key that doesn't exist. This
causes a `TypeError` in the `for` loop a few lines down. This change simply
returns an iterable type to avoid the error.
Make use of improved connect_to_aws that throws an exception
if a region can't be connected to (e.g. eu-central-1 requires
boto 2.34 onwards)
Add eu-central-1 to the two modules that hardcode their regions
Add us-gov-west-1 to ec2_ami_search to match documentation!
This pull request makes use of the changes in ansible/ansible#9419
