Mark as insecure throws exception

As a reviewer I want to be able to mark extensions as insecue

Problem: there is a fatal error atm, if you try this

(1/1) #700 T3o\Ter\Exception\InternalServerErrorException
Warning: No usergroup for reviewers has been defined on the server side. Aborting ...

in /var/www/html/extensions/ter/class.tx_ter_api.php line 602

AC: