Document library allows you to create a new document without uploading a file AND without having a name (without a file should be allowed).
1. Add a new page called DL Test
2. Add the document library portlet to the page
3. Add a folder called Test
4. Click "Add Document"
5. Click "User the classic uploader"
7. Don't select a document to upload and don't add a name.
8. Click "Publish"