Default to :latest version of push jobs (Chef 13 fix)

[mivok]

Description

If you don't specify a version, it defaults to 'nil'. Until chef 13, this wasn't a problem, as it would result in the resource's default value of :latest being used. However, in Chef 13, this results in the version literally being set to nil, causing an error.

This change simply adds :latest as an explicit fallback option when setting the version to install.

https://docs.chef.io/deprecations_custom_resource_cleanups.html#nil-properties is the link to the deprecation, although it appears the issue addressed in this PR is slightly different, but results in the same warning and error.

Check List

• [x] All tests pass. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/TESTING.MD
• [ ] New functionality includes testing.
• [ ] New functionality has been documented in the README if applicable
• [x] All commits have been signed for the Developer Certificate of Origin. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/CONTRIBUTING.MD

[iennae]

Hi,

Thanks for the contribution. PR #120 has got the fix we are thinking of using. The underlying behavior of chef-ingredient if a version isn't sent will install latest.