RFR: 8309959: JFR: Display N/A for missing data amount

[Thomas Stuefe]

On Tue, 13 Jun 2023 18:41:39 GMT, Erik Gahlin <egahlin at openjdk.org> wrote:

> Could I have a review of a follow up fix to JDK-8309550.
> 
> Testing: jdk/jdk/jfr
> 
> Plan is to clean up the formatting of missing values after, or during, refactoring of ValueFormatter, but this will done as an enhancement as it involves larger code changes.
> 
> Thanks
> Erik

LGTM

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Marked as reviewed by stuefe (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14454#pullrequestreview-1478956178