RFR: 8354513: Bug in j.u.l.Handler deadlock test allows null pointer during race condition

[Daniel Fuchs]

On Mon, 14 Apr 2025 10:56:45 GMT, David Beaumont <duke at openjdk.org> wrote:

> Add null pointer guard in test formatter (since it can be called with a log record without parameters).

Trivial fix. Looks like the right thing to do.

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Marked as reviewed by dfuchs (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24619#pullrequestreview-2764029327