This can be done much more cleanly... `configuration.getList()` returns an `Option`, which will never be null. Just do this:

```
lazy val knownStatus = Play.configuration().getList("metrics.knownStatuses").getOrElse(List(Status.OK, Status.BAD_REQUEST, Status.NOT_FOUND, Status.CREATED, Status.TEMPORARY_REDIRECT, status.INTERNAL_SERVER_ERROR))
```