New Attribute of a Rule should allow empty string
New Attribute of a Rule should allow empty string

gbbr/superdesk,petrjasek/superdesk-ntb,mdhaman/superdesk,amagdas/superdesk,gbbr/superdesk,petrjasek/superdesk,verifiedpixel/superdesk,verifiedpixel/superdesk,fritzSF/superdesk,ioanpocol/superdesk-ntb,ioanpocol/superdesk,marwoodandrew/superdesk,darconny/superdesk,sjunaid/superdesk,gbbr/superdesk,vied12/superdesk,pavlovicnemanja92/superdesk,pavlovicnemanja/superdesk,plamut/superdesk,plamut/superdesk,mdhaman/superdesk,marwoodandrew/superdesk,superdesk/superdesk-ntb,liveblog/superdesk,Aca-jov/superdesk,liveblog/superdesk,superdesk/superdesk,superdesk/superdesk-ntb,pavlovicnemanja92/superdesk,akintolga/superdesk-aap,marwoodandrew/superdesk,darconny/superdesk,thnkloud9/superdesk,verifiedpixel/superdesk,hlmnrmr/superdesk,fritzSF/superdesk,sivakuna-aap/superdesk,superdesk/superdesk-aap,superdesk/superdesk,marwoodandrew/superdesk-aap,petrjasek/superdesk,liveblog/superdesk,liveblog/superdesk,hlmnrmr/superdesk,pavlovicnemanja/superdesk,mugurrus/superdesk,akintolga/superdesk,akintolga/superdesk,fritzSF/superdesk,plamut/superdesk,marwoodandrew/superdesk-aap,petrjasek/superdesk-ntb,petrjasek/superdesk-server,fritzSF/superdesk,akintolga/superdesk-aap,amagdas/superdesk,superdesk/superdesk-ntb,superdesk/superdesk-ntb,ancafarcas/superdesk,pavlovicnemanja92/superdesk,fritzSF/superdesk,mdhaman/superdesk,Aca-jov/superdesk,pavlovicnemanja/superdesk,amagdas/superdesk,akintolga/superdesk,ancafarcas/superdesk,verifiedpixel/superdesk,vied12/superdesk,amagdas/superdesk,superdesk/superdesk,liveblog/superdesk,akintolga/superdesk-aap,vied12/superdesk,mdhaman/superdesk-aap,petrjasek/superdesk-server,petrjasek/superdesk-ntb,marwoodandrew/superdesk-aap,sivakuna-aap/superdesk,petrjasek/superdesk-ntb,amagdas/superdesk,petrjasek/superdesk,darconny/superdesk,Aca-jov/superdesk,sivakuna-aap/superdesk,sjunaid/superdesk,mugurrus/superdesk,mdhaman/superdesk-aap,superdesk/superdesk,superdesk/superdesk-aap,mdhaman/superdesk-aap,akintolga/superdesk,ioanpocol/superdesk,marwoodandrew/superdesk-aap,mdhaman/superdesk-aap,petrjasek/superdesk,mugurrus/superdesk,plamut/superdesk,pavlovicnemanja92/superdesk,marwoodandrew/superdesk,hlmnrmr/superdesk,verifiedpixel/superdesk,pavlovicnemanja92/superdesk,vied12/superdesk,thnkloud9/superdesk,vied12/superdesk,sivakuna-aap/superdesk,superdesk/superdesk-aap,sivakuna-aap/superdesk,sjunaid/superdesk,marwoodandrew/superdesk,pavlovicnemanja/superdesk,ancafarcas/superdesk,ioanpocol/superdesk,akintolga/superdesk,superdesk/superdesk-aap,ioanpocol/superdesk-ntb,thnkloud9/superdesk,plamut/superdesk,ioanpocol/superdesk-ntb,akintolga/superdesk-aap