on import, when enumerating through the 'draft content', OSX environments will have hidden binary encoded quarantine files. We don't want to try to process these as they will throw an exception when trying to be parsed. It's harmless - the import goes on fine - but it's a lot of clutter in the output logs.
PR feedback
pylint error fix
Merge pull request #636 from edx/fix/cdodge/dont-process-osx-hidden-files-on-imports

on import, when enumerating through the 'draft content', OSX environment...