Function empty_reducer_finalizes_to_none

nodedb-array/src/query/aggregate.rs:291–295

()

    #[test]
    fn empty_reducer_finalizes_to_none() {
        let t = tile(&[(0, None)]);
        let r = aggregate_attr(&t, 0, Reducer::Sum);
        assert_eq!(r.finalize(), None);
    }

    #[test]
    fn group_by_buckets_by_dim_value() {