Fix bug preventing search results being sorted by date
Fix bug preventing search results being sorted by date

Although it might be worth noting that not all search results can be
sorted by date - for example where a person page is returned - and that
such results will always appear at the end of the last page, regardless
of whether results are in ascending or descending order

ken-muturi/pombola,ken-muturi/pombola,ken-muturi/pombola,geoffkilpin/pombola,mysociety/pombola,mysociety/pombola,geoffkilpin/pombola,mysociety/pombola,ken-muturi/pombola,ken-muturi/pombola,mysociety/pombola,geoffkilpin/pombola,mysociety/pombola,geoffkilpin/pombola,mysociety/pombola,ken-muturi/pombola,geoffkilpin/pombola,geoffkilpin/pombola