I'm trying to clone a repository over HTTP, but am getting a 500 (see also T9677).
```
2015/10/31 05:27:31 [error] 2162#0: *203 FastCGI sent in stderr: "PHP message: [2015-10-31 16:27:31] EXCEPTION: (InvalidArgumentException) Argument 1 passed to AphrontView::setUser() must be an instance of PhabricatorUser, null given, called in /usr/src/phabricator/src/aphront/response/Aphront404Response.php on line 14 and defined at [<phutil>/src/error/PhutilErrorHandler.php:200]
PHP message: arcanist(head=master, ref.master=baf5eb8a8795), phabricator(head=master, ref.master=98a301a59b1d), phutil(head=master, ref.master=59f5a8d2bb82)
PHP message: #0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer, array) called at [<phabricator>/src/view/AphrontView.php:19]
PHP message: #1 <#2> AphrontView::setUser(NULL) called at [<phabricator>/src/aphront/response/Aphront404Response.php:14]
PHP message: #2 <#2> Aphront404Response::buildResponseString() called at [<phabricator>/src/aphront/response/AphrontResponse.php:26]
PHP message: #3 <#2> AphrontResponse::getContentIterator() called at [<phabricator>/src/aphront/sink/AphrontHTTPSink.php:102]
PHP message: #4 <#2> AphrontHTTPSink::writeResponse(Aphront404Response) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:274]
PHP message: #5 <#2> AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink, MultimeterControl) called at [<phabricator>/src/aphront/configuration/AphrontApplicationConfiguration.php:149]
PHP message: #6 <#2> AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phabricator>/webroot/index.php:17]
PHP message: #7 phlog(InvalidArgumentException) called at [<phabricator>/src/aphront/response/AphrontUnhandledExceptionResponse.php:20]
PHP message: #8 AphrontUnhandledExceptionResponse::setException(InvalidArgumentException) called at [<phabricator>/webroot/index.php:21]" while reading response header from upstream, client: 10.0.0.1, server: phabricator.local, request: "GET /diffusion/TEST/test.git/info/refs?service=git-
```