🐛 controllers without For() fail to start

[tsuzu]

Fixes #2101

When calling Builder.Complete() without For, blder.forInput.object is nil.
If source.Kind with nil Type is passed to Watch(), it results in must specify Kind.Type error at

controller-runtime/pkg/source/source.go

Line 116 in 69f0938

return fmt.Errorf("must specify Kind.Type")

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: tsuzu / name: Tsuzuki Tsuchiya (daf890e)

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[alvaroaleman]

Please add a test for this, for example by checking how often ctrl.Watch gets called

[tsuzu]

Adding a fake controller.Controller is difficult for me.
Instead, I added a test with doReconcileTest.

[alvaroaleman]

/ok-to-test

[alvaroaleman]

Thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

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

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[alvaroaleman]

/cherrypick release-0.14

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@alvaroaleman: once the present PR merges, I will cherry-pick it on top of release-0.14 in a new PR and assign it to you.

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/cherrypick release-0.14

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[k8s-infra-cherrypick-robot]

@alvaroaleman: new pull request created: #2108

In response to this:

/cherrypick release-0.14

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