Automated cherry pick of #8317: Don't output empty sections in the manifests #8324
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In our kube-dns manifest for 1.6 we often had an empty section,
normalization converted this to `{}` which causes `kubectl apply` to
fail.
We can simply skip empty objects when outputing.
(The tests are split out for easier cherry-picking, should we choose to)
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Cherry pick of #8317 on release-1.17.
#8317: Don't output empty sections in the manifests
For details on the cherry pick process, see the cherry pick requests page.