When a theme setting of type `upload` has a default upload, it should return the URL of the specified default upload until a custom upload is used for the setting. However, currently this isn't the case and we get null instead of the default upload URL.
The reason for this is because the `super` method of `#value` already returns the default upload URL (if there's one), so we can't pass that to `cdn_url` which expects an upload ID:
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| .. | ||
| backups | ||
| csv | ||
| db | ||
| emails | ||
| encodings | ||
| feed | ||
| i18n | ||
| images | ||
| json | ||
| md | ||
| media | ||
| mmdb | ||
| multisite | ||
| onebox | ||
| plugins | ||
| scss | ||
| site_settings | ||
| theme_settings | ||
| themes | ||
| woff2 | ||