`DefaultPubSubRpc,get` returns a `Future` such that `Future.get()` returns `null` if the resource was not found. In `PubSubImpl`. In [PubSubImpl](https://github.com/GoogleCloudPlatform/gcloud-java/blob/pubsub-alpha/gcloud-java-pubsub/src/main/java/com/google/cloud/pubsub/PubSubImpl.java#L76) transform the result using `(Topic/Subscription).fromPbFunction()` which do not handle the `null` case.
DefaultPubSubRpc,getreturns aFuturesuch thatFuture.get()returnsnullif the resource was not found. InPubSubImpl.In PubSubImpl transform the result using
(Topic/Subscription).fromPbFunction()which do not handle thenullcase.