Replace null reference with empty string
Replace null reference with empty string

fghaas/edx-configuration,nttks/configuration,nikolas/configuration,armaan/edx-configuration,arbrandes/edx-configuration,kencung/configuration,B-MOOC/configuration,pedrorib/istx,Unow/configuration,hmcmooc/ec2-edx-configuration,antoviaque/configuration,Softmotions/configuration,glengal/configuration,hastexo/edx-configuration,open-craft/configuration,Carlos2005/configuration,cyanna/configuration,Pieros/configuration,EDUlib/configuration,michaelsteiner19/open-edx-configuration,openfun/configuration,cyanna/configuration,nunpa/configuration,CredoReference/configuration,AlfiyaZi/configuration,proversity-org/configuration,gsehub/configuration,nttks/configuration,xiangjf/configuration,edx/configuration,gashac03/ubuntu,rue89-tech/configuration,stvstnfrd/configuration,CredoReference/configuration,cecep-edu/configuration,IONISx/edx-configuration,hks-epod/configuration,hks-epod/configuration,usernamenumber/configuration,mitodl/configuration,pedrorib/istx,omarkhan/configuration,leansoft/configuration,fghaas/edx-configuration,nunpa/configuration,antshin72/configuration,glengal/configuration,armaan/edx-configuration,zhengjunwei/configuration,joshhu/configuration,EDUlib/configuration,gashac03/ubuntu,hmcmooc/ec2-edx-configuration,omarkhan/configuration,openfun/configuration,kencung/configuration,michaelsteiner19/open-edx-configuration,Stanford-Online/configuration,zhengjunwei/configuration,IndonesiaX/configuration,sudheerchintala/LearnEra-Configuration,Livit/Livit.Learn.EdX.configuration,knehez/configuration,IONISx/edx-configuration,alu042/configuration,omarkhan/configuration,negritobomb/edxplat,Livit/Livit.Learn.EdX.configuration,lgfa29/configuration,sudheerchintala/LearnEra-Configuration,Stanford-Online/configuration,knehez/configuration,kursitet/configuration,cyanna/configuration,arifsetiawan/configuration,Pieros/configuration,eduStack/configuration,nikolas/configuration,bugcy013/edx_infra,vasyarv/configuration,marcore/configuration,hastexo/edx-configuration-old,UXE/edx-configuration,alu042/configuration,antoviaque/configuration,armaan/edx-configuration,4eek/configuration,kmoocdev/configuration,proversity-org/configuration,louyihua/configuration,alu042/configuration,leansoft/configuration,jp-bpl/configuration,zhengjunwei/configuration,gsehub/configuration,hks-epod/configuration,nikolas/configuration,arifsetiawan/configuration,louyihua/configuration,jorgeomarmh/configuration,cecep-edu/configuration,kmoocdev/configuration,Unow/configuration,vasyarv/configuration,4eek/configuration,EDUlib/configuration,stvstnfrd/configuration,arbrandes/edx-configuration,hastexo/edx-configuration-old,joshhu/configuration,leansoft/configuration,nunpa/configuration,AlfiyaZi/configuration,B-MOOC/configuration,beacloudgenius/configuration,chudaol/configuration,UXE/edx-configuration,4eek/configuration,hastexo/edx-configuration,kmoocdev/configuration,pobrejuanito/configuration,pobrejuanito/configuration,beacloudgenius/configuration,openfun/configuration,chudaol/configuration,proversity-org/configuration,hastexo/edx-configuration-old,lgfa29/configuration,Softmotions/configuration,knehez/configuration,beacloudgenius/configuration,appsembler/configuration,CredoReference/configuration,jp-bpl/configuration,vasyarv/configuration,edx/configuration,cyanna/configuration,jorgeomarmh/configuration,kursitet/configuration,bugcy013/edx_infra,open-craft/configuration,nttks/configuration,gsehub/configuration,bugcy013/edx_infra,pobrejuanito/configuration,IndonesiaX/configuration,antoviaque/configuration,UXE/edx-configuration,Stanford-Online/configuration,EDUlib/configuration,Carlos2005/configuration,rue89-tech/configuration,pedrorib/istx,B-MOOC/configuration,jp-bpl/configuration,negritobomb/edxplat,arifsetiawan/configuration,Carlos2005/configuration,Softmotions/configuration,edx/configuration,stvstnfrd/configuration,4eek/configuration,gsehub/configuration,arbrandes/edx-configuration,hastexo/edx-configuration-old,gsehub/configuration,openfun/configuration,beacloudgenius/configuration,xiangjf/configuration,kmoocdev/configuration,edx/configuration,chenshuchuan/configuration,LearnEra/LearnEra-Configuration,usernamenumber/configuration,cecep-edu/configuration,vasyarv/configuration,hastexo/edx-configuration,chudaol/configuration,mitodl/configuration,Stanford-Online/configuration,gashac03/ubuntu,sudheerchintala/LearnEra-Configuration,michaelsteiner19/open-edx-configuration,jp-bpl/configuration,lgfa29/configuration,AlfiyaZi/configuration,yrchen/configuration,proversity-org/configuration,nunpa/configuration,kencung/configuration,appsembler/configuration,LearnEra/LearnEra-Configuration,negritobomb/edxplat,yrchen/configuration,mitodl/configuration,jorgeomarmh/configuration,mitodl/configuration,chenshuchuan/configuration,arbrandes/edx-configuration,stvstnfrd/configuration,stvstnfrd/configuration,AlfiyaZi/configuration,IndonesiaX/configuration,yrchen/configuration,open-craft/configuration,Pieros/configuration,zhengjunwei/configuration,Livit/Livit.Learn.EdX.configuration,Softmotions/configuration,appsembler/configuration,Unow/configuration,pedrorib/istx,proversity-org/configuration,LearnEra/LearnEra-Configuration,lgfa29/configuration,rue89-tech/configuration,knehez/configuration,marcore/configuration,chenshuchuan/configuration,pobrejuanito/configuration,nikolas/configuration,yrchen/configuration,hks-epod/configuration,IONISx/edx-configuration,antshin72/configuration,IONISx/edx-configuration,bugcy013/edx_infra,marcore/configuration,Pieros/configuration,chudaol/configuration,michaelsteiner19/open-edx-configuration,eduStack/configuration,jp-bpl/configuration,Carlos2005/configuration,usernamenumber/configuration,IndonesiaX/configuration,open-craft/configuration,hmcmooc/ec2-edx-configuration,Stanford-Online/configuration,appsembler/configuration,kencung/configuration,rue89-tech/configuration,rue89-tech/configuration,glengal/configuration,EDUlib/configuration,usernamenumber/configuration,antoviaque/configuration,arbrandes/edx-configuration,armaan/edx-configuration,UXE/edx-configuration,joshhu/configuration,kursitet/configuration,hastexo/edx-configuration,xiangjf/configuration,eduStack/configuration,negritobomb/edxplat,jorgeomarmh/configuration,antshin72/configuration,leansoft/configuration,CredoReference/configuration,hastexo/edx-configuration,hks-epod/configuration,xiangjf/configuration,louyihua/configuration,alu042/configuration,antshin72/configuration,kursitet/configuration,fghaas/edx-configuration,marcore/configuration,omarkhan/configuration,fghaas/edx-configuration,gashac03/ubuntu,arifsetiawan/configuration,glengal/configuration,joshhu/configuration,louyihua/configuration,nttks/configuration,Livit/Livit.Learn.EdX.configuration