Bug 31239: Fix incorrect AV linked to a mapped biblio column

Bug 31239: Fix incorrect AV linked to a mapped biblio column

If an AV is linked to a MARC field mapped with a biblio column, the
search_for_data_inconsistencies.pl script might explode with

The method Koha::Biblioitem->title is not covered by tests!

Trace begun at /kohadevbox/koha/Koha/Object.pm line 875
Koha::Object::AUTOLOAD('Koha::Biblioitem=HASH(0x556b67fa7168)') called at misc/maintenance/search_for_data_inconsistencies.pl line 246

Test plan:
For a given framework, pick a biblio using it
Link 245$a with an authorised value category
Run the script
=> Notice that with this script applied you will see the warning
=> Without this patch you got the error

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>