In --format=directory mode, remove .dat files with zero data records, and mark that table's toc.dat entry that it's an empty table.
Justification: lots of empty tables means lots of teeny-tiny files in the DB's dump directory. That unnecessarily bloats the fs, and makes "du -c" really really slow.
But why are there sooo many empty tables? You shouldn't have so many empty tables!
Yeah, well, software (especially 3rd-party software that must be generic to satisfy the varying needs of a large and varied customer base) can't always be perfectly tuned to the precise and immediate needs of a particular site. Partitioning makes that much much worse.
We've survived this long without it, but pgbackrest has a similar feature (though implemented differently from how pg_dump would do it), and it's really handy.
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Don't boil me, I'm still alive.
