Redirect to document after unpublish

Steps to reproduce:

• Publish a document.
• Navigate to published document.
• Click on the UNPUBLISH document and confirm.
  => Document is unpublished, but user is still viewing the publication of the document.

Expected behavior:

• User should either be redirected to the View tab of the document (if no other publications of the document exist).
  OR
• User should be redirected to the Publications tab of the document (if there are other existing publications of the document).