Add a alert() for error in the option object
Add a alert() for error in the option object

alex2wong/wordcloud2.js,ZainRizvi/wordcloud2.js,alex2wong/wordcloud2.js,alex2wong/wordcloud2.js,ZainRizvi/wordcloud2.js,timdream/wordcloud2.js,timdream/wordcloud2.js,ZainRizvi/wordcloud2.js,timdream/wordcloud2.js