Load relationships for revision

Summary:
In the commit message parser worker, it tries to get relationships for a
revision without first loading them. (D3444 introduced the change.) This
is where the get happens, so I'm adding the load here - maybe it should be
added in the CommitMessageParserWorker instead?

Test Plan: Made this change, and my taskmaster daemons stopped failing.

Reviewers: epriestley, vrana

Reviewed By: vrana

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3448

src/applications/repository/worker/commitmessageparser/PhabricatorRepositoryCommitMessageParserWorker.php

@@ -102,6 +102,7 @@ abstract class PhabricatorRepositoryCommitMessageParserWorker
     if ($revision_id) {
       $revision = id(new DifferentialRevision())->load($revision_id);
       if ($revision) {
+        $revision->loadRelationships();
         queryfx(
           $conn_w,
           'INSERT IGNORE INTO %T (revisionID, commitPHID) VALUES (%d, %s)',