Summary: Fixes T6395. Ref T6350. I guess I missed this code spot in prior testing / I definitely didn't run an empty commit through it. Works now though.
Test Plan: made an empty commit and observed stuck importing status and errors in phd log. applied patch and commit successfully imported with no errors. made another empty commit and it imported as well
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6350, T6395
Differential Revision: https://secure.phabricator.com/D10746
Summary: Ref T4195. I need this for the Herald pre-commit rules, and it generally simplifies things.
Test Plan: Used `reparse.php` plus `var_dump()` to inspect refs in Git, Mercurial and SVN repos. They all looked correct and reparsed correctly.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T4195
Differential Revision: https://secure.phabricator.com/D7804
