SPARK-3082. yarn.Client.logClusterResourceDetails throws NPE if requeste...

...d queue doesn't exist
Oh I see. Many of the other arguments in `ClientArguments` were initialized to null so I thought this was the same. Then it's fine.

(On an unrelated note initializing the queue to this value makes little sense to me. We don't set the `QUEUE` attribute anywhere in the code, and creating a fresh `SparkConf` won't actually pick this config up because it is not prefixed with "spark". This seems to be always initialized to "default")