Fix 1687: only allow requesting several roles.
Fix 1687: only allow requesting several roles.

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