Return empty 204 instead of 404 from api/live/happening_now
Return empty 204 instead of 404 from api/live/happening_now

Having too many 404s is triggering alerts when there's no featured live event. Return an empty 204 response instead.

madbook/reddit-plugin-liveupdate,madbook/reddit-plugin-liveupdate,madbook/reddit-plugin-liveupdate