No exact/lossy block information in EXPLAIN ANALYZE for a bitmap heap scan

I've noticed that EXPLAIN ANALYZE shows no information on exact/lossy
blocks for a bitmap heap scan when both the numbers of exact/lossy pages
retrieved by the node are zero.  Such an example is shown below.  I
think it would be better to suppress the 'Heap Blocks' line in that
case, based on the same idea of the 'Buffers' line.  Patch attached.

postgres=# explain (analyze, verbose, buffers) select * from test where
id < 10;
                                                    QUERY PLAN
------------------------------------------------------------------------------------------------------------------
 Bitmap Heap Scan on public.test  (cost=4.29..8.31 rows=1 width=29)
(actual time=0.006..0.006 rows=0 loops=1)
   Output: id, inserted, data
   Recheck Cond: (test.id < 10)
   Heap Blocks:
   Buffers: shared hit=2
   ->  Bitmap Index Scan on test_pkey  (cost=0.00..4.29 rows=1 width=0)
(actual time=0.003..0.003 rows=0 loops=1)
         Index Cond: (test.id < 10)
         Buffers: shared hit=2
 Planning time: 0.118 ms
 Execution time: 0.027 ms
(10 rows)

Thanks,

Best regards,
Etsuro Fujita