Improve message handling in VR logger by explicitly mapping null and undefined values

[MakingSpiderSense]

This pull request makes a small change to the vr-logger component to improve how console messages are logged. The update ensures that null and undefined values are explicitly logged as strings, rather than as empty strings or causing errors.

https://trello.com/c/yhfzY979

[Copilot]

Pull Request Overview

This PR improves the VR logger component's message handling by explicitly converting null and undefined values to their string representations instead of relying on the default toString() behavior.

• Enhanced null/undefined handling in console message logging
• Replaced single-line mapping with explicit conditional checks for better clarity

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