Deleting Unrevealed/Anon Collection traps works in Unrevealed/Anon

1. Create a collection with checkboxes for Unrevealed and Anon using not Testy (Testy2 is okay) account

2. As the collection owner, add a work by Testy to the collection

   1. Accept the collection invite as necessary

3. Once the work is added to the collection, delete the collection without removing or revealing the work

4. Verify display of the work

   1. Work will show as a mystery work

   2. Editing the work does not list a collection

   3. Going to http://test.archiveofourown.org/users/testy/collection_items does not show the work under any of the three tabs

Case example http://test.archiveofourown.org/works/1062580 (testy is the creator, collection was "3906_nuke_test" under my testing account)

sarken noted that we may need to check what other collections works are in after a collection is deleted, and if none of them are anon/unrevealed, then update the work's anon/unrevealed status.