Fix for NullReferenceException in Oculus Hardware

[parisacognitive3d]

Description

• Checking if the current subsystem isn't null before checking it's id

Height Task ID(s) (If applicable): https://c3d.height.app/T-5991

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [N/A] I have commented my code, particularly in hard-to-understand areas
• [N/A] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [N/A] Any dependent changes have been merged and published in downstream modules
• [x] I have assigned this PR to myself in GitHub
• [x] I have assigned and notified Reviewers for this PR