use better null check

[cdhanna]

Ticket

https://disruptorbeam.atlassian.net/browse/BEAM-XXXX

Brief Description

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Checklist

• Have you added appropriate text to the CHANGELOG.md files?

Add those to list or remove the list below altogether:

• Have you documented all your public methods and interfaces? Have you identified intention and assumptions?
• Have you included a docs file as /wiki/BEAM-1234.md? You need to provide a docs file.

Notes

When you are merging a feature branch into main, please squash merge and make sure the final commit contains any relevent JIRA ticket number. If you are merging from main to staging, or staging to production, please use a regular merge commit.

Does this introduce tech-debt? If so, have you added an entry to the Tech-debt document?

[Copilot]

Pull request overview

Updates Unity editor icon-loading code to use UnityEngine.Object-style existence checks (if (!texture)) instead of explicit null comparisons when caching icon/texture references.

Changes:

• Replaced == null checks with !<Texture> checks for cached Texture icon fields in LoadUnityIcons.
• Replaced == null checks with !<Texture> checks for cached Texture art/icon fields in LoadNonConfigurableIcons.

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