Proposed fix for #13268

Fixes #13268.
Technique for checking "Is this is the DOM?" chosen based on [this perf test](http://jsperf.com/jquery-element-in-dom/2) from [this SO thread](http://stackoverflow.com/questions/3086068/how-do-i-check-whether-a-jquery-element-is-in-the-dom).
Semicolon

There's also another one on the line below, seems like that one too slipped through.