Bug 31086: Throw an exception when a hold is stored with no branchcode

Bug 31086: Throw an exception when a hold is stored with no branchcode

To test:
1 - Apply first 2 patches
2 - On staff client, find a biblio, place hold, select a patron
3 - Before creating hold, right click on 'Pickup location'
4 - Inspect the element
5 - In the console find the top <li> for pickup, and right click
6 - Select 'Delete node'
7 - Save hold
8 - You get an exception/error

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>