Reject an entire feed import if a required field in feeds_tamper fails

my_module.module

/**
 * Implements hook_feeds_after_parse().
 */
function my_module_feeds_after_parse(FeedsSource $source, FeedsParserResult $result) {

  // $sql = "SELECT COUNT(*) FROM feeds_log WHERE request_time = " . REQUEST_TIME . " AND id = " . $source->id . " AND type LIKE '%feeds_tamper:required%'" ;

  $number_of_prase_errors = db_select('feeds_log', 'f')
    ->fields('f', array('flid'))
    ->condition('request_time', REQUEST_TIME, '=')
    ->condition('id', $source->id, '=')
    ->condition('type', '%feeds_tamper:required%', 'LIKE')
    ->countQuery()->execute()->fetchField();

    if ($number_of_prase_errors > 0) {
      // unset all the items so nothing gets uploaded
      $result->items = array();
      $args = array();
      $source->log('my_module:reject_upload', 'There was a problem with the uploaded file. Please correct the above errors and try again.', $args);
      drupal_set_message(t('There was a problem with the uploaded file. Please correct the above errors and try again.', $args));
    }
}

/**
 * Implements hook_module_implements_alter().
 *
 * Make sure that our feeds_after_parse is called AFTER the same hook provided in feeds_tamper
 */
function my_module_module_implements_alter(&$implementations, $hook) {
  if ($hook == 'feeds_after_parse') {
    // Move my_module_rdf_mapping() to the end of the list. module_implements()
    // iterates through $implementations with a foreach loop which PHP iterates
    // in the order that the items were added, so to move an item to the end of
    // the array, we remove it and then add it.
    $group = $implementations['my_module'];
    unset($implementations['my_module']);
    $implementations['my_module'] = $group;
  }
}