fixed nil check bug in registrations controller
fixed nil check bug in registrations controller

DigitalCurationCentre/roadmap,DMPRoadmap/roadmap,CDLUC3/dmptool,CDLUC3/dmptool,CDLUC3/dmptool,briri/roadmap,DigitalCurationCentre/roadmap,DMPRoadmap/roadmap,DigitalCurationCentre/roadmap,CDLUC3/roadmap,DMPRoadmap/roadmap,CDLUC3/roadmap,CDLUC3/dmptool,briri/roadmap,briri/roadmap,CDLUC3/roadmap,CDLUC3/roadmap