Automatic merge from submit-queue

kubectl: don't display an empty list when trying to get a single resource that isn't found

Return immediately when attempting to get a singular resource that isn't found, so that we avoid
printing out a List if the output format is something like json or yaml.

Before:

```
$ kubectl get pod/foo -o yaml
apiVersion: v1
items: []
kind: List
metadata: {}
pods "foo" not found
```

After:

```
$ kubectl get pod/foo -o yaml
pods "foo" not found
```

Fixes #28243 

@kubernetes/kubectl @kubernetes/rh-ux @smarterclayton @liggitt @deads2k @metral