Fix for case when attr() returns undefined
Fix for case when attr() returns undefined

nguyenuit/jcarousel,Orehouse/jcarousel,burakkp/jcarousel,mrkiwi/jcarousel,cssfirefly/jcarousel,Hanzig/jcarousel,Hanzig/jcarousel,jsor/jcarousel,cssfirefly/jcarousel,stormwild/jcarousel,mrkiwi/jcarousel,Orehouse/jcarousel,npmcomponent/jsor-jcarousel,jsor/jcarousel,nguyenuit/jcarousel,stormwild/jcarousel