Bug: excluded files link broken with blob undefined

[kinghrothgar]

Setup:
I have the latest hound running scraping private Github repos via git@ urls.

Bug:
After doing a search, if follow the Excluded Files to /excluded_files.html, then select a repo, and select a specific file the link is invalid. The blob is undefined, ex: https://github.com/some-org/some-repo/blob/undefined/path/to/excluded/file. The links to files with matches in it however works as expected and the blob is defined as the checked out commit.