🐛 correct kind source type

[terinjokes]

Reverse the nil check in the String function of the internal Kind source to print the type when known.

Fixes: 2add01e ("Event, source, handler, predicates: Use generics")

[k8s-ci-robot]

Hi @terinjokes. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[terinjokes]

/cc alvaroaleman

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: c78274afb2176a86fdf2f9055d171e17f726768a

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, terinjokes

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[alvaroaleman]

/ok-to-test
/cherrpick release-0.18

Thank you!

[alvaroaleman]

/cherrpick release-0.18

[alvaroaleman]

/cherrypick release-0.18

[k8s-infra-cherrypick-robot]

@alvaroaleman: new pull request created: #2809

In response to this:

/cherrypick release-0.18

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