RFR: 8291954: Use Optional.isEmpty instead of !Optional.isPresent in java.base

[Brian Burkhalter]

On Mon, 1 Aug 2022 06:51:44 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> I propose to replace usages of !Optional.isPresent() with Optional.isEmpty method.
> It's makes code a bit easier to read.
> Noticing negation before long chain of method calls is hard.

Marked as reviewed by bpb (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/9697