Automatic merge from submit-queue
return warning on empty list result in kubectl get
**Release note**:
```release-note
NONE
```
The current default behavior of `kubectl get` is to return an empty
output when there are no resources to display. This patch improves
usability by returning a warning through stderr in the case of an empty
list.
##### Before
`$ kubectl get pods`
- *empty output*
##### After
`$ kubectl get pods`
```
There are no resources to display.
```
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