Code review comment for lp:~tzeentch-gm/bzr/666897-get-file-by-path-attr-error

I know, I was thinking about it, but the thing is I can't substantiate the exact circumstances that cause that problem to pop up. The method is already used in tests in ``bzrlib.tests.blackbox.test_versioning.SubdirCommit`` but it does not fail.

Roughly has something to do with Tree subclass used (WorkingTree 4+ in this case) and possibly with that tree having uncomitted changes. If you have any ideas let me know and I can try things out.