Sets default values from storage.
Drupal\locale\StringInterface $string: The string object.
string $table: (optional) The table name.
protected function dbStringDefaults($string, $table = NULL) {
  $table = $table ? $table : $this
    ->dbStringTable($string);
  if ($table && ($schema = drupal_get_schema($table))) {
    $values = array();
    foreach ($schema['fields'] as $name => $info) {
      if (isset($info['default'])) {
        $values[$name] = $info['default'];
      }
    }
    $string
      ->setValues($values, FALSE);
  }
}