[2016-11-10 07:36:20] EXCEPTION: (Exception) Can't parse an empty diff! at [<arcanist>/src/parser/ArcanistDiffParser.php:191]
arcanist(head=stable, ref.master=9c056c5cc887, ref.stable=e17fe43ca3fe), phabricator(head=stable, ref.master=b441e8b81e31, ref.stable=111c63955155), phutil(head=stable, ref.master=c72eb747e706, ref.stable=40e473e05788)
  #0 <#2> ArcanistDiffParser::parseDiff(string) called at [<phabricator>/src/applications/diffusion/herald/HeraldCommitAdapter.php:244]
  #1 <#2> HeraldCommitAdapter::loadCommitDiff() called at [<phabricator>/src/applications/diffusion/herald/HeraldCommitAdapter.php:259]
  #2 phlog(Exception) called at [<phabricator>/src/applications/diffusion/herald/HeraldCommitAdapter.php:262]
  #3 HeraldCommitAdapter::loadDiffContent(string) called at [<phabricator>/src/applications/diffusion/herald/DiffusionCommitDiffContentAddedHeraldField.php:17]
  #4 DiffusionCommitDiffContentAddedHeraldField::getHeraldFieldValue(PhabricatorRepositoryCommit) called at [<phabricator>/src/applications/herald/adapter/HeraldAdapter.php:102]
  #5 HeraldAdapter::getHeraldField(string) called at [<phabricator>/src/applications/herald/engine/HeraldEngine.php:370]
  #6 HeraldEngine::getObjectFieldValue(string) called at [<phabricator>/src/applications/herald/engine/HeraldEngine.php:365]
  #7 HeraldEngine::getConditionObjectValue(HeraldCondition, HeraldCommitAdapter) called at [<phabricator>/src/applications/herald/engine/HeraldEngine.php:277]
  #8 HeraldEngine::doesRuleMatch(HeraldRule, HeraldCommitAdapter) called at [<phabricator>/src/applications/herald/engine/HeraldEngine.php:91]
  #9 HeraldEngine::applyRules(array, HeraldCommitAdapter) called at [<phabricator>/src/applications/herald/engine/HeraldEngine.php:43]
  #10 HeraldEngine::loadAndApplyRules(HeraldCommitAdapter) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:3088]
  #11 PhabricatorApplicationTransactionEditor::applyHeraldRules(PhabricatorRepositoryCommit, array) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:1008]
  #12 PhabricatorApplicationTransactionEditor::applyTransactions(PhabricatorRepositoryCommit, array) called at [<phabricator>/src/applications/repository/worker/PhabricatorRepositoryCommitHeraldWorker.php:102]
  #13 PhabricatorRepositoryCommitHeraldWorker::parseCommit(PhabricatorRepository, PhabricatorRepositoryCommit) called at [<phabricator>/src/applications/repository/worker/PhabricatorRepositoryCommitParserWorker.php:51]
  #14 PhabricatorRepositoryCommitParserWorker::doWork() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorWorker.php:123]
  #15 PhabricatorWorker::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php:171]
  #16 PhabricatorWorkerActiveTask::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorTaskmasterDaemon.php:22]
  #17 PhabricatorTaskmasterDaemon::run() called at [<phutil>/src/daemon/PhutilDaemon.php:181]
  #18 PhutilDaemon::execute() called at [<phutil>/scripts/daemon/exec/exec_daemon.php:127]