desc: 1468 -- Empty batched_replaces_t constructed
tests:
  - rb: r.table_create('1468')
    ot: ({'created':1})
  - rb: r.table('1468').insert([{}, {}, {}])['inserted']
    ot: (3)
  - rb: r.table('1468').replace(non_atomic:'true'){|row| r.js("{}")}
    ot: ({"unchanged"=>0,"skipped"=>0,"replaced"=>0,"inserted"=>0,"first_error"=>"Cannot convert javascript `undefined` to ql::datum_t.","errors"=>3,"deleted"=>0})
  - rb: r.table_drop('1468')
    ot: ({'dropped':1})
