No results when "All languages" selected

When the "All languages" option is selected in the Twingly block configuration no results are returned.

To fix, change:
$lang = (!empty($params['lang'])) ? 'lang:'.implode('|', $params['lang']) : '';

To:
$lang = (!empty($params['lang']) && $params['lang'][0] != '0') ? 'lang:'.implode('|', $params['lang']) : '';