return empty cursor list if user isn't admin
return empty cursor list if user isn't admin

HarvardEconCS/turkserver-meteor,TurkServer/turkserver-meteor,HarvardEconCS/turkserver-meteor,HarvardEconCS/turkserver-meteor,VirtualLab/turkserver-meteor,VirtualLab/turkserver-meteor,TurkServer/turkserver-meteor,VirtualLab/turkserver-meteor,TurkServer/turkserver-meteor