sunnygleason/carrierwave — comment on commit 3ff4fcce961bc110a3d67168c37a1b7b511a511a
File: lib/carrierwave/uploader/download.rb line 47
By mkdynamic:

with the above:

```ruby
if mime_type && mime_type.extensions.first
mime_type.extensions.first
else
''
end
```