fix: RemoveItems should preserve empty list and map

[pjiang-dev]

fixes #305

Modify tests for new behavior:
RemoveItems will maintain [] or {} instead of changing to null

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: pjiang-dev / name: Peter Jiang (9138e08, 9c093d1, c760b1d)

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[k8s-ci-robot]

Hi @pjiang-dev. Thanks for your PR.

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[pjiang-dev]

Ping @jpbetz

[jpbetz]

/lgtm
/approve

[pjiang-dev]

/retest

[k8s-ci-robot]

@pjiang-dev: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[jpbetz]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jpbetz, pjiang-dev

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