Bug fix: calling detect_loops() on an empty path will raise an exception.
Bug fix: calling detect_loops() on an empty path will raise an exception.

axt/angr,angr/angr,angr/angr,tyb0807/angr,zhuyue1314/angr,axt/angr,cureHsu/angr,zhuyue1314/angr,schieb/angr,lowks/angr,GuardianRG/angr,avain/angr,tyb0807/angr,chubbymaggie/angr,f-prettyland/angr,mingderwang/angr,f-prettyland/angr,f-prettyland/angr,tyb0807/angr,avain/angr,xurantju/angr,chubbymaggie/angr,chubbymaggie/angr,mingderwang/angr,iamahuman/angr,iamahuman/angr,iamahuman/angr,lowks/angr,terry2012/angr,GuardianRG/angr,terry2012/angr,schieb/angr,haylesr/angr,haylesr/angr,fjferrer/angr,cureHsu/angr,fjferrer/angr,xurantju/angr,angr/angr,schieb/angr,axt/angr