Bug 35535: Allow for cancellation of holds with or without a reason

Bug 35535: Allow for cancellation of holds with or without a reason

TO TEST:
1. Have a waiting hold on a particular barcode
2. Have at least 1 HOLD_CANCELLATION auth value
3. Check in the barcode and try to cancel the hold on the modal while
   selecting a reason.
=> SUCCESS: You can cancel a hold when selecting a reason.
4. Repeat 1-3 but not selecting any reason.
=> SUCCESS: Hold cancelled correctly.
5. Delete all HOLD_CANCELLATION auth values.
6. Repeat Try 1-3
=> SUCCESS: No reason displayed
=> FAIL: Cancelling does nothing. There's an error in the browser
   inspector
7. Apply this patch
8. Repeat 1-3
=> SUCCESS: No reason displayed
=> SUCCESS: Cancelling works
9. Sign off :-D

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Edit: amended the test plan to make it clearer
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>