RFR: 8274894: Use Optional.empty() instead of ofNullable(null) in HttpResponse.BodySubscribers.discarding

[Andrey Turbanov]

On Wed, 18 Aug 2021 07:55:35 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> Usage of `Optional.ofNullable` is unnecessary when value is known. If it's `null` value Optional.empty() should be preferred, as it doesn't perform redundant `null` check.

Not sure if it worth separate issue. But this this is small improvement in http client code.

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PR: https://git.openjdk.java.net/jdk/pull/5159