Fix comment modal esc

[SpennyNDaJets]

Summary

Sometimes the comment modal does not fully unrender from the dom, leaving the modal overlay rendered and making the entire UI unclickable.

Return early when the modal is not rendered.

https://www.loom.com/share/1e09ae17d1444f8ca3362bc8bba01982?sid=364293d6-8afb-447d-8022-07d798de2f78

How did you test this change?

1. View a session
2. Change to comment mode, and start leaving a comment
3. Press esc to exit the comment modal

• The UI should still be interactable

Are there any deployment considerations?

N/A

Does this work require review from our design team?

N/A

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Latest commit: 98d2df9

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