fix: `otherParticipant` may be undefined #709

Job	Run time
Deploy messenger-clone-react	4m 34s
Deploy zoom-clone-react	4m 5s
Deploy egress-composite	4m 53s
Deploy livestream-app-react	4m 34s
Deploy audio-rooms	3m 39s
Deploy react-dogfood	7m 3s
	28m 48s

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