predis: make $connection in RedisLogger nullable
predis: make $connection in RedisLogger nullable

This is apparently null in redis cluster connections, because of https://github.com/predis/predis/blob/d6da14daa81b63558ffd07ab5cc6946f207f4ac4/src/Connection/Aggregate/RedisCluster.php#L366-L368

snc/SncRedisBundle