tg-1736 #closed -> 404 instead 500 when call api/v1/projects/slug instead api/v1/project/id
Merge pull request #185 from taigaio/bug/1736/get_object_or_404_return_500

tg-1736 #closed -> 404 instead 500 when call api/v1/projects/slug instead api/v1/project/id