Cannot Delete NPM Scoped Folder via UI

Scoped "folders" are not deleted when attempting to do so via the browse UI. 

To reproduce:

1. Create an NPM repo, for example a proxy to https://registry.npmjs.org/
2. Populate proxy repo with at least one scoped package.
3. Go to the browse panel and select the NPM proxy repo.
4. Select a scoped folder and then in the right hand panel click the "Delete folder" button.
5. Wait for a moment and refresh the browser.

Expected:
The scope and all included packages are deleted.

Actual:
The scope and all included packages are not removed.

Workaround:
Individually delete each package/asset under the scoped folder.