Enforce array on node revision table class attribute

 * Implements form_alter() for table.

 */

function gin_theme_suggestions_table_alter(array &$suggestions, array $variables): void {

  if (isset($variables['attributes']['class']) && in_array('field-multiple-table', $variables['attributes']['class'])) {

  if (empty($variables['attributes']['class'])) {

    return;

  }

  if (!($variables['attributes']['class'] instanceof \Traversable)) {

    $variables['attributes']['class'] = [$variables['attributes']['class']];

  }

  if (in_array('field-multiple-table', $variables['attributes']['class'])) {

    $suggestions[] = 'table__simple';

  }

}