Title field assumed when it may not exist

Attempting a Preview on a Content Type with a Link field without a Title, it assumes there is a title and does not check first.

Notice: Undefined index: title in _link_sanitize() (line 595 of /websites/modules/contrib/link/link.module).

Problem code:
// Use the title defined by the user at the widget level.
elseif (drupal_strlen(trim($item['title']))) {
$title = $item['title'];
}