[action/puppetfile] Raise error on nonexistent Puppetfile
[action/puppetfile/purge] Use correct trace variable
[action/puppetfile/check] Rescue all errors raised while loading
Merge pull request #259 from adrienthebo/issue/1.4.x/gh-254-puppetfile-install-exit-code

(GH-254) Improve puppetfile action error handling