Added empty set check
Added empty set check

gsun83/cbioportal,istemi-bahceci/cbioportal,bihealth/cbioportal,jjgao/cbioportal,shrumit/cbioportal-gsoc-final,angelicaochoa/cbioportal,xmao/cbioportal,bihealth/cbioportal,holtgrewe/cbioportal,IntersectAustralia/cbioportal,angelicaochoa/cbioportal,pughlab/cbioportal,IntersectAustralia/cbioportal,jjgao/cbioportal,angelicaochoa/cbioportal,IntersectAustralia/cbioportal,adamabeshouse/cbioportal,fcriscuo/cbioportal,j-hudecek/cbioportal,cBioPortal/cbioportal,cBioPortal/cbioportal,sheridancbio/cbioportal,xmao/cbioportal,d3b-center/pedcbioportal,inodb/cbioportal,leedonghn4/cbioportal,yichaoS/cbioportal,kalletlak/cbioportal,holtgrewe/cbioportal,pughlab/cbioportal,zhx828/cbioportal,bihealth/cbioportal,zhx828/cbioportal,bihealth/cbioportal,kalletlak/cbioportal,IntersectAustralia/cbioportal,holtgrewe/cbioportal,leedonghn4/cbio-portal-webgl,leedonghn4/cbioportal,onursumer/cbioportal,j-hudecek/cbioportal,zhx828/cbioportal,xmao/cbioportal,j-hudecek/cbioportal,kalletlak/cbioportal,onursumer/cbioportal,leedonghn4/cbio-portal-webgl,onursumer/cbioportal,gsun83/cbioportal,n1zea144/cbioportal,d3b-center/pedcbioportal,zheins/cbioportal,leedonghn4/cbioportal,kalletlak/cbioportal,n1zea144/cbioportal,inodb/cbioportal,inodb/cbioportal,pughlab/cbioportal,xmao/cbioportal,shrumit/cbioportal-gsoc-final,cBioPortal/cbioportal,n1zea144/cbioportal,yichaoS/cbioportal,bengusty/cbioportal,istemi-bahceci/cbioportal,cBioPortal/cbioportal,gsun83/cbioportal,adamabeshouse/cbioportal,HectorWon/cbioportal,kalletlak/cbioportal,jjgao/cbioportal,HectorWon/cbioportal,n1zea144/cbioportal,d3b-center/pedcbioportal,zhx828/cbioportal,adamabeshouse/cbioportal,fcriscuo/cbioportal,cBioPortal/cbioportal,j-hudecek/cbioportal,inodb/cbioportal,pughlab/cbioportal,d3b-center/pedcbioportal,mandawilson/cbioportal,mandawilson/cbioportal,bihealth/cbioportal,leedonghn4/cbioportal,sheridancbio/cbioportal,angelicaochoa/cbioportal,bengusty/cbioportal,adamabeshouse/cbioportal,leedonghn4/cbio-portal-webgl,yichaoS/cbioportal,pughlab/cbioportal,d3b-center/pedcbioportal,bengusty/cbioportal,fcriscuo/cbioportal,mandawilson/cbioportal,shrumit/cbioportal-gsoc-final,angelicaochoa/cbioportal,mandawilson/cbioportal,holtgrewe/cbioportal,holtgrewe/cbioportal,istemi-bahceci/cbioportal,istemi-bahceci/cbioportal,fcriscuo/cbioportal,onursumer/cbioportal,yichaoS/cbioportal,HectorWon/cbioportal,gsun83/cbioportal,fcriscuo/cbioportal,leedonghn4/cbio-portal-webgl,angelicaochoa/cbioportal,angelicaochoa/cbioportal,xmao/cbioportal,zheins/cbioportal,pughlab/cbioportal,fcriscuo/cbioportal,zhx828/cbioportal,jjgao/cbioportal,zhx828/cbioportal,pughlab/cbioportal,sheridancbio/cbioportal,zheins/cbioportal,sheridancbio/cbioportal,IntersectAustralia/cbioportal,adamabeshouse/cbioportal,inodb/cbioportal,mandawilson/cbioportal,kalletlak/cbioportal,j-hudecek/cbioportal,leedonghn4/cbio-portal-webgl,d3b-center/pedcbioportal,zheins/cbioportal,zheins/cbioportal,yichaoS/cbioportal,jjgao/cbioportal,onursumer/cbioportal,mandawilson/cbioportal,zhx828/cbioportal,sheridancbio/cbioportal,gsun83/cbioportal,jjgao/cbioportal,IntersectAustralia/cbioportal,kalletlak/cbioportal,istemi-bahceci/cbioportal,onursumer/cbioportal,HectorWon/cbioportal,gsun83/cbioportal,inodb/cbioportal,inodb/cbioportal,xmao/cbioportal,bengusty/cbioportal,shrumit/cbioportal-gsoc-final,leedonghn4/cbioportal,j-hudecek/cbioportal,shrumit/cbioportal-gsoc-final,shrumit/cbioportal-gsoc-final,adamabeshouse/cbioportal,n1zea144/cbioportal,IntersectAustralia/cbioportal,shrumit/cbioportal-gsoc-final,HectorWon/cbioportal,holtgrewe/cbioportal,jjgao/cbioportal,leedonghn4/cbio-portal-webgl,leedonghn4/cbioportal,cBioPortal/cbioportal,n1zea144/cbioportal,yichaoS/cbioportal,bengusty/cbioportal,sheridancbio/cbioportal,adamabeshouse/cbioportal,bihealth/cbioportal,gsun83/cbioportal,zheins/cbioportal,n1zea144/cbioportal,HectorWon/cbioportal,bihealth/cbioportal,yichaoS/cbioportal,bengusty/cbioportal,mandawilson/cbioportal,istemi-bahceci/cbioportal,d3b-center/pedcbioportal