RFR: 8259: Several JFR pages throwing exceptions after JMC-8244

[Alex Macdonald]

On Thu, 26 Sep 2024 05:10:00 GMT, Suchita Chaturvedi <schaturvedi at openjdk.org> wrote:

> This PR is to fix the NPE issue on different screens of JMC after 8244 fix.
> JVM Internals
> Garbage Collections
> GC Configuration
> Class Loading
> Recording
> 
> All these screens are working fine now.

Marked as reviewed by aptmac (Reviewer).

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PR Review: https://git.openjdk.org/jmc/pull/590#pullrequestreview-2331706009