Bug 36701: Adjust confirmation to hide empty div

Bug 36701: Adjust confirmation to hide empty div

To test:
1. Place a hold on any bib record
2. Cancel the hold by clicking the trash can icon next to it
--> Note that there is an empty red page section in the modal
3. Apply patch and refresh the page
4. Repeat steps 1-2
--> No empty red page section
5. Confirm that the test plan from bug 33174 still works

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>