function testExec_ThrowsMissingFrom() {
  var query = new lf.query.SelectBuilder(hr.db.getGlobal(), []);
  // 522: Invalid usage of select().
  return lf.testing.util.assertPromiseReject(522, query.exec());
}
Tests that Select#exec() fails if from() has not been called first.
@return {!IThenable}