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fix kubectl -o

Fix kubectl -o error message:
Before this change:
```
kubectl get pods -o foo
error: unable to match a printer suitable for the output format "" and the options specified: &get.PrintFlags{JSONYamlPrintFlags:(*genericclioptions.JSONYamlPrintFlags)(0x23aa610), NamePrintFlags:(*genericclioptions.NamePrintFlags)(0xc42058b4e0), TemplateFlags:(*printers.KubeTemplatePrintFlags)(0xc4206765e0), CustomColumnsFlags:(*printers.CustomColumnsPrintFlags)(0xc420676620), HumanReadableFlags:(*get.HumanPrintFlags)(0xc4204eb180), NoHeaders:(*bool)(0xc4206fefbc), OutputFormat:(*string)(0xc42058b4d0)}
```

After this change:
```
Kubectl get pods -o foo
error: unable to match a printer suitable for the output format "foo", allowed formats are: json,yaml,name,template,go-template,go-template-file,templatefile,jsonpath,jsonpath-file,custom-columns-file,custom-columns,wide
```



**What this PR does / why we need it**:

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
kubectl will list all allowed print formats when an invalid format is passed.
```