desc: 1468 -- Empty batched_replaces_t constructed
table_variable_name: tbl
tests:
  - rb: tbl.insert([{}, {}, {}])['inserted']
    ot: (3)
  - rb: tbl.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})