[Plugin: Taxonomy Drill-Down] RESET doesn't work if no results are found

If I do a search and a result is found I can click the RESET button to return to the base page and it works correctly (example: http://www.dmngoodstaging.com/alliance/content-type/issue-briefs/?program&topic-area&geographic-location&state)

However, if no results are found and I click RESET, nothing happens. It stays on the same page (example:http://www.dmngoodstaging.com/alliance/resource-library/?program=child-and-adult-care-food-program-cacfp&topic-area=needs-and-resource-assesments&geographic-location=indian-reservation&state=arizona&content-type=issue-briefs)

Why would this be happening?