JQuery move items in list when checked

I've been looking for some code which basically moves checkboxes to the top of a list once they have been checked.

I came accross Move checkboxes on checked jQuery which gave me a great start, but I'm now stuck on a further issue.

If I add an <li> item into this <ul> list, but its just a standard item without an <input> section, it stops the whole code from working.

Is there a simple work around for this that I haven't seen? I'm struggling to be honest as I'm just starting with JQuery, so its quite new to me.

Thanks in advance.