Final page of favourites repeats itself

[SpangleLabs]

If you go to a final page of a user's favourites, and specify ?next={fav_id} for the last fav on the page, it displays the same page.

This seems to be an FA issue, but regardless is one we can mitigate in the API, simply check if the last fav id equals the next parameter, return an empty list.

I think this would be much neater functionality for the API, what do you think?