RFR: 8297682: Use Collections.emptyIterator where applicable

[Sergey Tsypanov]

On Mon, 7 Nov 2022 17:30:20 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Instead of `Collections.emptyList().iterator()` we can use `Collections.emptyIterator()` method.
> Actual implementation of `java.util.Collections.EmptyList#iterator` does exactly this - just calls `emptyIterator` method.

LGTM

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Marked as reviewed by stsypanov (Author).

PR: https://git.openjdk.org/jdk/pull/11025