We do have 24/7 streams though like nostr:npub12hcytyr8fumy3axde8wgeced523gyp6v6zczqktwuqeaztfc2xzsz3rdp4 radio. The way to do this is checking if the stream is still sending a signal. If it is dead, hide it. But, you also want to have a keep-alive in case OBS crashes or the internet drops for a few...