Add currentStyle null check for issue #259
Add currentStyle null check for issue #259

emil-mi/rangy,zimme/rangy,shuizhongyueming/rangy,etodd/rangy,lpsBetty/rangy,timdown/rangy,zimme/rangy,GerHobbelt/Rangy,brymacto/rangy,djbuch/rangy,GerHobbelt/Rangy,brymacto/rangy,djbuch/rangy,izhan/rangy,timdown/rangy,yangdm2015/vue-rangy,yangdm2015/vue-rangy,lpsBetty/rangy,wotzisname/rangy,shuizhongyueming/rangy,etodd/rangy,sashless/rangy,izhan/rangy,emil-mi/rangy,sashless/rangy,wotzisname/rangy