See IRC. We don't always reach loadPage(), particularly if canViewerUseQueryApplication() fails.
Perform initialization steps in willExecute() instead.
Trace from IRC:
2015/04/02 11:48:32 [error] 26979#0: *48012 FastCGI sent in stderr: "PHP message: [2015-04-02 11:48:32] EXCEPTION: (Exception) You must execute() the query before accessing the identifier map. at [<phabricator>/src/applications/repository/query/PhabricatorRepositoryQuery.php:134] PHP message: #0 PhabricatorRepositoryQuery::getIdentifierMap() called at [<phabricator>/src/applications/diffusion/remarkup/DiffusionRepositoryRemarkupRule.php:26] PHP message: #1 DiffusionRepositoryRemarkupRule::loadObjects(array) called at [<phabricator>/src/infrastructure/markup/rule/PhabricatorObjectRemarkupRule.php:309] PHP message: #2 PhabricatorObjectRemarkupRule::didMarkupText() called at [<phutil>/src/markup/engine/PhutilRemarkupEngine.php:292] PHP message: #3 PhutilRemarkupEngine::postprocessText(array) called at [<phabricator>/src/infrastructure/markup/PhabricatorMarkupEngine.php:138] PHP message: #4 PhabricatorMarkupEngine::process() called at [<phabricator>/src/infrastructure/markup/PhabricatorMarkupEngine.php:71] PHP message: #5 PhabricatorMarkupEngine::renderOneObject(PhabricatorMarkupOneOff, string, PhabricatorUser) called at [<phabricator>/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldRemarkup.php:47] PHP message: #6 PhabricatorStandardCustomFieldRemarkup::renderPropertyViewValue(array) called at [<phabricator>/src/infrastructure/customfield/field/PhabricatorCustomField.php:1191] PHP message: #7 PhabricatorCustomField::renderPropertyViewValue(array) called at [<phabricator>/src/infrastructure/customfield/field/PhabricatorCustomFieldList.php:176] PHP message: #8 PhabricatorCustomFieldList::appendFieldsToPropertyList(PhabricatorProject, PhabricatorUser, PHUIPropertyListView) called at [<phabricator>/src/applications/project/controller/PhabricatorProjectProfileController.php:220] PHP message: #9 PhabricatorProjectProfileController::buildPropertyListView(PhabricatorProject, PhabricatorActionListView) called at [<phabricator>/src/applications/project/controller/PhabricatorProjectPr