Author: sergey.chernyshev
Description:
When 'validate' modifier (http://www.mediawiki.org/wiki/Widgets#Validate_modifier) is used on widget parameters, sites that use PHP version < 5.2.0 break because filter extension is not available: http://us.php.net/manual/en/filter.installation.php
Proper solution is to upgrade PHP, but code should be modified to display an error in place of a widget.
Version: unspecified
Severity: enhancement