11f3a8cfca
Summary: Fixes T12090. In obscure situations lost to the mists of time, the `changes` column could be `null`. Force a string cast so the migration finishes, even though these changesets are likely meaningless. Test Plan: I did a force-reapply as a sanity check: ``` $ ./bin/storage upgrade -f --apply phabricator:20161213.diff.01.hunks.php ``` That went cleanly; it would only have caught dramatic errors, but I didn't completely butcher things. Reviewers: chad Reviewed By: chad Maniphest Tasks: T12090 Differential Revision: https://secure.phabricator.com/D17168
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