[Haml] Fix a small reference error.
[Haml] Fix a small reference error.

Closes gh-213

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