Fix for issue #16

hyrax/app/helpers/hyrax_helper.rb

@@ -26,9 +26,17 @@ module HyraxHelper
 
     bucket = Aws::S3::Resource.new(region: ENV['S3_REGION']).bucket(file_set.parent_works.first.id)
 
-    latest_version_uri = file_set.latest_content_version.uri
-    file_key = "/#{file_set_id}/files/#{latest_version_uri.split("/")[-3]}/#{file_set.title.first}"
-
+    begin
+      latest_version_uri = file_set.latest_content_version.uri
+      file_key = "/#{file_set_id}/files/#{latest_version_uri.split("/")[-3]}/#{file_set.title.first}"
+    rescue
+      begin
+        latest_version_uri = file_set.files[0]
+        file_key = "/#{file_set_id}/files/#{latest_version_uri.split("/")[-1]}/#{file_set.title.first}"
+      rescue
+        return nil
+      end
+    end
     url_options = {
       expires_in: 60.minutes.seconds.to_i,
       response_content_disposition: "attachment; filename=\"#{file_key}\""