Bug 42244: Fix JS TypeError on patrons ILL table

The multipleSelect plugin is used on the ILL requests table but is not
present when viewing a patron's ILL request history. This patch avoids a
JS TypeError by checking if the plugin exists before calling it.

To test:
- Enable ILLModule setting
- ILL Requests > New ILL Request
- Metadata doesn't matter but attach to a patron account, e.g. use the
"Acevedo" surname on KTD
- Go to the Patron > ILL requests history
- View browser's JS console, note TypeError
- Apply patch
- Refresh page, TypeError goes away

Signed-off-by: Chris Mathevet <chris.mathevet@inLibro.com>

Amended-by: Jonathan Druart
Tidy

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/js/ill-list-table.js

@@ -661,6 +661,10 @@ $(document).ready(function () {
     }
 
     function addStatusOptions(statuses) {
+        // Bug 42244: no multiselect on patron's ILL table
+        if (!$.fn.multipleSelect || !$("#illfilter_status").length) {
+            return;
+        }
         $("#illfilter_status").children().remove();
         statuses
             .sort((a, b) => a.str.localeCompare(b.str))