RFR: 8357675: Amend headless message

[Alexey Ivanov]

On Mon, 26 May 2025 18:25:36 GMT, Phil Race <prr at openjdk.org> wrote:

> > The blank line between the message and the stack trace is very uncommon.
> 
> It looks OK to me, but its obviously a matter of preference.

It could be a matter of preference, but it's also a matter of _consistency_, and I can't remember if I've ever seen an exception message which had a line break as its last character.

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PR Comment: https://git.openjdk.org/jdk/pull/25453#issuecomment-2910565870