Bug 37375: Fix holdings table not loading if MARC framework is missing certain 952...

Bug 37375: Fix holdings table not loading if MARC framework is missing certain 952 subfields

When you've catalogued a record with MARC framework that is for some reason missing
certain 952 subfields (8, a, b, c, or y), holdings table is no longer loading but
stuck in the "Processing..." loader.

To test, open Koha in two browser tabs:

IN TAB 1 (framework configuration):
1. Create a new MARC framework "TEST", based on the default MARC framework

IN TAB 2 (record view):
2. Create a new record using MARC framework "TEST"
3. Add an item to the newly created record
4. Observe item visible on the record's holdings list

IN TAB 1 (framework configuration):
5. Delete all 952 subfields in framework "TEST" except: 8, a, b, c, y

IN TAB 2 (record view):
6. Refresh page
7. Observe item visible on the record's holdings list
8. Open your browser's console for upcoming error messages

Iterating remaining subfields in following order,
| <FIELD> | <NAME>
------------------------------------------------------
| 952$8   | row._strings.collection_code
| 952$c   | row._strings.location
| 952$a   | row._strings.home_library_id
| 952$b   | row._strings.holding_library_id
| 952$y   | row._strings.item_type_id

IN TAB 1 (framework configuration):
9. Delete subfield <FIELD> in framework "TEST"

IN TAB 2 (record view):
10. Refresh page
11. Observe error "Uncaught TypeError: <NAME> is undefined" (Firefox)
(or Cannot read properties of undefined (reading 'str') (Chromium))

12. Apply patch

IN TAB 2:
13. Refresh page
14. Observe item visible on the record's holdings list

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>