Verify Records still exist when trying to destroy them

With nested elements, we might have orphaned elements with nested elements
or elements with orphaned nested elements.

This change reloads the record in question in order to make sure it is
still there. If not, the reload will return `nil`, and nothing terrible happens.

lib/alchemy/tasks/tidy.rb

@@ -130,7 +130,7 @@ def remove_duplicate_folded_pages
       def destroy_orphaned_records(records, class_name)
         records.each do |record|
           log "Destroy orphaned #{class_name}: #{record.inspect}"
-          record.destroy
+          record.reload.try(:destroy)
         end
       end
     end