Cleanup code so following warnings no longer appear in the error log
[25-Jul-2020 16:45:52 Europe/Amsterdam] PHP Warning: Invalid argument supplied for foreach() in /var/www/wikiportret.nl/public/common/formfunctions.php on line 25 [25-Jul-2020 16:45:52 Europe/Amsterdam] PHP Warning: Invalid argument supplied for foreach() in /var/www/wikiportret.nl/public/images/single.php on line 171 [25-Jul-2020 16:50:15 Europe/Amsterdam] PHP Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/wikiportret.nl/public/common/formfunctions.php on line 156