Bug 15496: Delete Bib After Moving Item

Bug 15496: Delete Bib After Moving Item

Librarians have requested the ability to delete records with no items
quickly and easily from the "Attach item" results page as items are
moved from one record to another.

Test Plan:
1) Apply this patch
2) Create 2 records with 2 items each
3) Move one item from record A to record B
4) You should see no change from pre-patch behavior
5) Move the second item from record A to record B
6) You should now see a "Delete record" button
7) Click the button
8) Note the record in question has been deleted

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>