[Sass] Allow 0-argument CSS functions.
[Sass] Allow 0-argument CSS functions.

haml/haml,DanteKaris/sass,baiyanghese/sass,liquidmetal/sass,JuanitoFatas/sass,tangposmarvin/sass,PMArtz92/sass,briangonzalez/sass,Nzaga/sass,amatsuda/haml,JuanitoFatas/sass,nickg33/sass,amitsuroliya/sass,uniba/hamldoc_ja,stewx/sass,keithpitty/haml,HugoRLopes/sass,Ahnita/sass,tangposmarvin/haml,modulexcite/sass,schneems/sass,ridixcr/sass,keithpitty/haml,cmpereirasi/sass,danielfein/sass,stewx/sass,stanhu/haml,saper/sass,MetaAshley/sass,lmetla/sass,askl56/sass,hcatlin/sass,rammy7219/sass,OrenBochman/sass,hcatlin/sass,oss-practice/sass,lmetla/sass,haml/haml,haml/haml,cmpereirasi/sass,Andrey-Pavlov/sass,nickg33/sass,dg1dd1ngs/haml,tenderlove/sass,srinivashappy/sass,zaru/sass,askl56/sass,xzyfer/sass,Ahnita/sass,MetaAshley/sass,dylannnn/sass,Anshdesire/sass,HugoRLopes/sass,Iamronan/sass,stanhu/haml,nicklima/sass,schneems/sass,saper/sass,PMArtz92/sass,OrenBochman/sass,xzyfer/sass,Iamronan/sass,chriseppstein/haml,rammy7219/sass,antonifs/sass,danielfein/sass,srinivashappy/sass,Industrys/sass,Galactix/sass,liquidmetal/sass,antonifs/sass,haml/haml,tangposmarvin/sass,jaroot32/sass,chriseppstein/haml,ridixcr/sass,amitsuroliya/sass,dg1dd1ngs/haml,Industrys/sass,macressler/haml,nazar-pc/haml,concord-consortium/haml,sideci-sample/sideci-sample-haml,jaroot32/sass,macressler/haml,chriseppstein/sass,zaru/sass,srawlins/sass,nicklima/sass,StephanieMak/sass,srawlins/sass,nazar-pc/haml,tangposmarvin/haml,Anshdesire/sass,Nzaga/sass,modulexcite/sass,14113/sass,Galactix/sass,StephanieMak/sass,dylannnn/sass,DanteKaris/sass,Andrey-Pavlov/sass