media_mover_api_update_file throwing a missing index warning

Code in question

  foreach (media_mover_api_verbs() as $verb) {
    if (isset($file["{$verb}_module"])) {
      _media_mover_api_module_invoke($file["{$verb}_module"], 'media_mover', 'update', $file["{$verb}_action"], $null = NULL, $file);
    }
  }

Patch to be attached soon.