[v4] git.PlainClone: "remote repository is empty" error from a normal repository

I'm doing something super straightforward:

	_, err := git.PlainClone(destinationPath, false, &git.CloneOptions{
		URL: "https://github.com/kubernetes-sigs/krew-index.git",
	})
	return err

This returns error remote repository is empty.

I tried os.MkdirAll(destinationPath, 0755) ahead of time, but it doesn't make any difference.

This is purely copied from example at https://godoc.org/gopkg.in/src-d/go-git.v4#example-PlainClone so it's surprising it didn't work out of the box.

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