BUGFIX: sort of feature is not run when feature vector is empty
BUGFIX: sort of feature is not run when feature vector is empty

BGCX262/zunda-hg-to-git,BGCX262/zunda-hg-to-git,jmizuno/zunda,jmizuno/zunda,jmizuno/zunda,BGCX262/zunda-hg-to-git