Steps to reproduce the issue

• Enable PHP error reporting in your webserver
• Create an empty Joomla category with no articles
• Access this Joomla category URL in your browser - it should display no articles
• Append ?format=feed&type=rss to this URL

Expected result

This should not generate any PHP warning.

Actual result

This should generate a PHP warning in either your browser or in your PHP error_log. The problem is that the PHP code loops through a $this->items array without checking whether this array is actually empty or not.

Additional comments

GitHub pull request will come right after submitting the issue. The pull request will simply add a if-check around the foreach-loop to prevent the PHP warning.