Summary: PhabricatorConfigRequestExceptionHandlerModule::renderModuleStatus calls this method on all AphrontRequestExceptionHandlers, but implementing the method is not required. This breaks /config/module/exception-handler/ when a custom exception handler does not implement it. Test Plan: Before applying this change: * Create a new RequestExceptionHandler in src/extensions/ and omit getRequestExceptionHandlerDescription * Visit http://phorge.localhost/config/module/exception-handler/ and see an exception After applying this change: * PHP fatal error about missing method * Add getRequestEceptionHandlerDescription * See the description on http://phorge.localhost/config/module/exception-handler/ Reviewers: O1 Blessed Committers, avivey Reviewed By: O1 Blessed Committers, avivey Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Differential Revision: https://we.phorge.it/D26570