fixed jQuery undefined error when target is hidden

I was getting the error in the screenshot below in my single page app, when the DOM element attached to superscrollorama was hidden using jQuery. Stepping through the debugger, I isolated the issue. I added an object literal as a default value to account for this case.

![screen shot 2013-07-09 at 12 25 53 pm](https://f.cloud.github.com/assets/3848154/770510/6a5f075c-e8ce-11e2-8f07-567c6c2fb560.png)

The repo where I initially made this change: https://github.com/gdi2290/RedditInsight