Fix the error message reported by Airbrake:
Fix the error message reported by Airbrake:

Error Message:
NoMethodError: undefined method `downcase' for nil:NilClass
Where:
submitted_content#edit
[PROJECT_ROOT]/app/helpers/access_helper.rb, line 10

expertiza/expertiza,kira0992/expertiza,KunmiaoYang/expertiza,mhhassan/expertiza,arpitashekhar/expertiza,arpitashekhar/expertiza,joshio1/expertiza,akshayjain114/expertiza,kira0992/expertiza,sid5788/expertiza,mhhassan/expertiza,rmmaily/expertiza,rmmaily/expertiza,ApertureScienceInnovators/expertiza,expertiza/expertiza,urmilparikh95/expertiza,sid5788/expertiza,KunmiaoYang/expertiza,redsock88/expertiza,ApertureScienceInnovators/expertiza,kira0992/expertiza,KunmiaoYang/expertiza,michaelamoran/expertiza,ApertureScienceInnovators/expertiza,redsock88/expertiza,redsock88/expertiza,michaelamoran/expertiza,urmilparikh95/expertiza,akshayjain114/expertiza,rmmaily/expertiza,redsock88/expertiza,michaelamoran/expertiza,joshio1/expertiza,urmilparikh95/expertiza,arpitashekhar/expertiza,urmilparikh95/expertiza,sid5788/expertiza,akshayjain114/expertiza,mhhassan/expertiza,joshio1/expertiza,ApertureScienceInnovators/expertiza,kira0992/expertiza,michaelamoran/expertiza,expertiza/expertiza,rmmaily/expertiza,expertiza/expertiza,joshio1/expertiza,arpitashekhar/expertiza,mhhassan/expertiza,akshayjain114/expertiza,KunmiaoYang/expertiza,sid5788/expertiza