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

[duke]

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).

@david-beaumont 
Your change (at version 67bea85bb13c3a7c46d28a458230a2a8e51e7f4d) is now ready to be sponsored by a Committer.

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PR Comment: https://git.openjdk.org/jdk/pull/24619#issuecomment-2801419045