Fix notice in content search plugin #5423
During #5276 I changed from catslug to catid in the call to ContentHelperRoute::getArticleRoute(). Unfortunately, we don't retrieve the catid from the database. That is why we get a notice here.
Search something in your Joomla installation and make sure that you have the content search plugin enabled. Notice the notice in the output for every content link.
Thanks @shur for spotting this bug.