UPSTREAM: 51750: output <none> for colums not found

[juanvallejo]

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1505796

Picks changes introduced in kubernetes/kubernetes#51750
to allow the custom-columns to succeed / print all known column values even when
an object's field does not exist.

Before

$ oc get dc mydc -o custom-columns=NAME:.metadata.name,UNKNOWN:.metadata.unknown
error: unknown is not found

After

$ oc get dc mydc -o custom-columns=NAME:.metadata.name,UNKNOWN:.metadata.unknown
NAME      UNKNOWN
mydc      <none>

cc @openshift/cli-review

[fabianofranz]

/assign

[fabianofranz]

/lgtm
/assign liggitt
for approval

[fabianofranz]

/kind bug

[juanvallejo]

/test extended_conformance_gce

[liggitt]

/approve

[openshift-merge-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabianofranz, juanvallejo, liggitt

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[juanvallejo]

/test extended_conformance_gce

[openshift-merge-robot]

Automatic merge from submit-queue (batch tested with PRs 16885, 17023).