Don't try to diff directories and other non-files in TFS.
Review Request #7373 — Created June 3, 2015 and submitted — Latest diff uploaded
It doesn't make sense to try to do diffs on changed things that aren't files,
such as added/deleted directories. This would previously result in an error
where there was no 'file-type' attribute in the changed items structure we get
from TFS.
Added a directory in a changeset and posted the result.