Fix division by zero error when using the same weight for every word.
Fix division by zero error when using the same weight for every word.

lucaong/jQCloud,QiQi57/jQCloud,mistic100/jQCloud,SamyCookie/jQCloud,SamyCookie/jQCloud,lucaong/jQCloud,lucaong/jQCloud,QiQi57/jQCloud,leider/jQCloud,mistic100/jQCloud,leider/jQCloud