setEmptyDestinationProperty example

        $multiple = $plugin->multiple();
      }
    }
    // Ensure all values, including nulls, are migrated.     if ($plugins) {
      if (isset($value)) {
        $row->setDestinationProperty($destination, $value);
      }
      else {
        $row->setEmptyDestinationProperty($destination);
      }
    }
  }

  /** * Fetches the key array for the current source record. * * @return array * The current source IDs. */
  protected function currentSourceIds() {