Remove count for unfiltered

https://trello.com/c/lPRYZuXa/287-finders-frontend-remove-number-of-finder-items-when-not-filtering-2

User research has shown that when users arrive at a finder page initally they were being confused by the number of reports in the finder appearing at the top. It made them think those were the number of results they ought to read, or the number of results that had been searched for. 

This PR removes the count from the top of the page if no filters have been selected. The number (and describing sentence) is entered if the results have been filtered in some way.