Fix fatal error when deleting a discussion forever. closes #842
Fix fatal error when deleting a discussion forever. closes #842

Luceos/core,renyuneyun/core,renyuneyun/core,malayladu/core,malayladu/core,flarum/core,datitisev/core,renyuneyun/core,flarum/core,Luceos/core,flarum/core,malayladu/core,datitisev/core,renyuneyun/core,malayladu/core,datitisev/core,datitisev/core,Luceos/core,Luceos/core