Update ResilienceProperties to correctly handle null values

[iliar-turdushev]

The PR adds logic to handling cases when the value being requested from ResilienceProperties is null.

Fixes #2299

[codecov]

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[RussKie]

Thank you!

[martincostello]

@iliar-turdushev Are you planning on any other Polly PRs for any work you're doing on the resilience libraries anytime soon? If not, I'll cut an 8.4.2 release.

[iliar-turdushev]

@iliar-turdushev Are you planning on any other Polly PRs for any work you're doing on the resilience libraries anytime soon? If not, I'll cut an 8.4.2 release.

No, I'm not. Perfect. I was about to ask when Polly 8.4.2 would be released. Thank you.

[martincostello]

There's an issue with our package signing I need to fix - once that's sorted I'll try to publish 8.4.2 again.

[github-actions]

Thanks for your contribution @iliar-turdushev - the changes from this pull request have been published as part of version 8.4.2 📦, which is now available from NuGet.org 🚀