Running rPa04af2a9eeee8269656bdaf61119cccace3a4ebd we get an error when opening a file in Diffusion's file browser. This seems to happen with any file we open in the file browser. The contents of the file and its history are loading and showing fine on that page, though.
**Error:**
`array_fill_keys() expects parameter 1 to be array, null given at [DiffusionBrowseFileController.php:275]`
**Stack trace:**
```
array_fill_keys called at [/opt/phabricator/src/applications/diffusion/controller/DiffusionBrowseFileController.php:275]
DiffusionBrowseFileController::buildCorpus called at [/opt/phabricator/src/applications/diffusion/controller/DiffusionBrowseFileController.php:94]
DiffusionBrowseFileController::processDiffusionRequest called at [/opt/phabricator/src/applications/diffusion/controller/DiffusionController.php:51]
DiffusionController::handleRequest called at [/opt/phabricator/src/aphront/AphrontController.php:69]
AphrontController::delegateToController called at [/opt/phabricator/src/applications/diffusion/controller/DiffusionBrowseMainController.php:36]
DiffusionBrowseMainController::processDiffusionRequest called at [/opt/phabricator/src/applications/diffusion/controller/DiffusionController.php:51]
DiffusionController::handleRequest called at [/opt/phabricator/src/aphront/configuration/AphrontApplicationConfiguration.php:226]
AphrontApplicationConfiguration::processRequest called at [/opt/phabricator/src/aphront/configuration/AphrontApplicationConfiguration.php:140]
AphrontApplicationConfiguration::runHTTPRequest called at [/opt/phabricator/webroot/index.php:19]
```