added additional invitation  token check
added additional invitation  token check

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