Bug 16320: [QA Follow-up] Remove warnings from ILSDI/Services.pm

Bug 16320: [QA Follow-up] Remove warnings from ILSDI/Services.pm

Removes:
Use of uninitialized value in string eq at /home/koha/kohaclone/C4/ILSDI/Services.pm line 373.
Use of uninitialized value in string eq at /home/koha/kohaclone/C4/ILSDI/Services.pm line 390.
Use of uninitialized value in string eq at /home/koha/kohaclone/C4/ILSDI/Services.pm line 399.
Use of uninitialized value in string eq at /home/koha/kohaclone/C4/ILSDI/Services.pm line 423.

Test plan:
Run t/db_dependent/ILSDI_Services.t

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>