[gallery_shortcode] Unordered list without elements after images

The ability to insert a gallery into a page/post is great, thank you!

But what is the trailing list at the end of the provided `gallery_shortcode.tmpl` for?:

```
<ul class="thumbnails">
        <li>
</ul>
```

On my page (generated with Nikola v8.2.3) this shows as a lonely dot after the gallery's images.

Am I missing something?