mitigate runtime panic when adopting cluster

[michaelhtm]

Description of Changes:
This change makes null checks to avoid panics.
Panic was noticed when trying to adopt a resource

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[a-hilaly]

can you please expand on the description of this PR?

[a-hilaly]

/lgtm

[michaelhtm]

/hold

[a-hilaly]

/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, michaelhtm

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[michaelhtm]

/retest

[a-hilaly]

/unhold

[michaelhtm]

/retest

[ack-prow]

@michaelhtm: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
eks-verify-attribution	febab9c	link	false	/test eks-verify-attribution

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