Don't generate full pages for pagination

[0xTim]

We have the weird scenario where we use the generate page for error pages and paginated pages (because these are the only pages we have) but for the error page we just pass the body in and for the paginated pages we have to check for this because we pass the full HTML in. This should be changed so the theme implementation generates the page HTML correctly and the paginated code only needs to pass the body in