#3417511: Fix errors reported by eslint on the Stream Wrapper example module.

Closes #3417511

modules/stream_wrapper_example/stream_wrapper_example.routing.yml

@@ -36,6 +36,7 @@ stream_wrapper_example.files.session:
     _controller: '\Drupal\system\FileDownloadController::download'
     scheme: session
   requirements:
+
     # Permissive regex to allow slashes in filepath see
     # http://symfony.com/doc/current/cookbook/routing/slash_in_parameter.html
     filepath: .+