Test incorrect? "MBTiles with no features"

[springmeyer]

I have a hunch that the MBTiles with no features test is not working right. The test passing and that indicates there are no features. But the database clearly has some data:

$ sqlite3 test/fixtures/src/no-features.mbtiles "select count(*) from tiles;"
21

So I think this needs a second look. Is the data in this file corrupt? Is that the intention behind the testcase? Do you remember @davidtheclark?

refs https://github.com/mapbox/mapbox-geostats/blob/master/test/test.js#L168-L173