Documentation problem with theme_image_style

Failure to provide at least an empty array() results in a PHP notice.

From the code:

function theme_image($variables) {
  $attributes = $variables['attributes'];
  $attributes['src'] = file_create_url($variables['path']);

  foreach (array('width', 'height', 'alt', 'title') as $key) {

    if (isset($variables[$key])) {
      $attributes[$key] = $variables[$key];
    }
  }

  return '<img' . drupal_attributes($attributes) . ' />';
}

That first line will result in an "Undefined index" notice.

@Dave Reid -- does the function require attributes or does it not?
And if the function is "for internal use only; module developers must not use" then the documentation should say so.

Thanks for the education. I've followed up on all the other issues I posted; you don't have to clean up behind me anymore... :)