Function json_add_null

lightningd/notification.c:289–292

Don't use this: omit fields instead! */

/* Don't use this: omit fields instead! */
static void json_add_null(struct json_stream *stream, const char *fieldname)
{
	json_add_primitive(stream, fieldname, "null");
}

static void channel_state_changed_notification_serialize(struct json_stream *stream,
							 struct lightningd *ld,