fix "keadm get nodes -A" printing namespaces while nodes without namespaces actually #3346
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What type of PR is this?
/kind bug
What this PR does / why we need it:
![image](https://user-images.githubusercontent.com/53475708/142988288-bbf8f7a5-3bb9-4d59-baa3-c0bc67e8437f.png)
![image](https://user-images.githubusercontent.com/53475708/142988385-91340ef1-ec69-4990-a0c5-e05eb807f52c.png)
When excute “keadm get nodes/node -A/--all-namespaces ”,keadm may not print the namespace with null while in original k8s,the resource of node does not have any namespaces.
before:
after this PR, not print NAMESPACE column anymore:
Which issue(s) this PR fixes:
Fixes #3345
Does this PR introduce a user-facing change?:
NONE