Fix a simple eslint issue
Fix a simple eslint issue

wmzhai/mantra-demo,warehouseman/meteor-mantra-kickstarter,warehouseman/meteor-mantra-kickstarter,LikeJasper/mantra-plus,hacksong2016/angel,mantrajs/mantra-sample-blog-app,mantrajs/mantra-dialogue,markoshust/mantra-sample-blog-app,warehouseman/meteor-mantra-kickstarter,worldwidejamie/silicon-basement,TheAncientGoat/mantra-sample-blog-coffee,Entropy03/jianwei,ShockiTV/mantra-test,mantrajs/meteor-mantra-kickstarter