Invalid sql generated when using `{$in: []}` on a related field

[forivall]

Using the model types in the tests

Owner.cursor({'reverses.id': {$in: []}}).include('reverses').toModels (err, owners) ->
    ...

will cause the error error: syntax error at or near ")"

[tgriesser]

I think this might be fixed with knex 7.x just fyi.