[Koha-bugs] [Bug 31524] New: Add ability to select no options for system preferences that allow multiple selections

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=31524

            Bug ID: 31524
           Summary: Add ability to select no options for system
                    preferences that allow multiple selections
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P5 - low
         Component: System Administration
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: aleisha at catalyst.net.nz
        QA Contact: testopia at bugs.koha-community.org
                CC: gmcharlt at gmail.com

There are many system preferences which can take multiple selections, for
example:
- ArticleRequestsMandatoryFields 
- ArticleRequestsMandatoryFieldsItemOnly 
- ArticleRequestsMandatoryFieldsRecordOnly 
- BatchCheckoutsValidCategories

By default they may have no options selected. Once any selection is saved, you
are then unable to save the system preference again with no selections.

Use the 'Select all' button to effectively select none. Notice you are unable
to save the system preference - it thinks there is 'nothing to save'.

We should be able to save a system preference with no selections.

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