Going to https://phabricator.private.virginmedia.net/project/edit/form/default/ , filling in the form, then clicking on 'Create New Project' results in a strl.en() null exception.
Stack trace:
```
EXCEPTION: (RuntimeException) strlen(): Passing null to parameter
#1 ($string) of type string is deprecated at [<arcanist>/src/error/PhutilErrorHandler.php:261]PHP message: arcanist(head=master, ref.master=df6c315ace5f, custom=4), phorge(head=master, ref.master=1720209f16c3)PHP message:
#0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer) called at [<phorge>/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php:87]PHP message:
#1 <#2> PhabricatorStandardCustomFieldInt::validateApplicationTransactions(PhabricatorProjectTransactionEditor, string, array) called at [<phorge>/src/infrastructure/customfield/field/PhabricatorCustomField.php:1011]PHP message:
#2 <#2> PhabricatorCustomField::validateApplicationTransactions(PhabricatorProjectTransactionEditor, string, array) called at [<phorge>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:2926]PHP message:
#3 <#2> PhabricatorApplicationTransactionEditor::validateTransaction(PhabricatorProject, string, array) called at [<phorge>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:1235]PHP message:
#4 <#2> PhabricatorApplicationTransactionEditor::applyTransactions(PhabricatorProject, array) called at [<phorge>/src/applications/transactions/editengine/PhabricatorEditEngine.php:1149]PHP message:
#5 <#2> PhabricatorEditEngine::buildEditResponse(PhabricatorProject) called at [<phorge>/src/applications/transactions/editengine/PhabricatorEditEngine.php:1000]PHP message:
#6 <#2> PhabricatorEditEngine::buildResponse() called at [<phorge>/src/applications/project/controller/PhabricatorProjectEditController.php:91]PHP message:
#7 <#2> PhabricatorProjectEditController::handleRequest(AphrontRequest) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:284]PHP message:
#8 phlog(RuntimeException) called at [<phorge>/src/aphront/handler/PhabricatorDefaultRequestExceptionHandler.php:41]PHP message:
#9 PhabricatorDefaultRequestExceptionHandler::handleRequestThrowable(AphrontRequest, RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:751]PHP message:
#10 AphrontApplicationConfiguration::handleThrowable(RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:296]PHP message:
#11 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink, MultimeterControl) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:204]PHP message:
#12 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phorge>/webroot/index.php:35]'
```