fix options with function

Author: weizhenye

src/create.js

@@ -20,7 +20,7 @@ function create(tagName, Highcharts) {
         if (isRenderer) {
           this.renderer = new Ctor(this.$el, this.width, this.height);
         } else {
-          var opts = JSON.parse(JSON.stringify(this.options));
+          var opts = this.options || {};
           opts.chart = opts.chart || {};
           opts.chart.renderTo = this.$el;
           this.chart = new Ctor(opts);