Bug 36923: Remove warnings from Holds/LocalHoldsPriority.t

Bug 36923: Remove warnings from Holds/LocalHoldsPriority.t

t/db_dependent/Holds/LocalHoldsPriority.t .. 1/7 Use of uninitialized value in numeric gt (>) at /kohadevbox/koha/C4/Reserves.pm line 866.
t/db_dependent/Holds/LocalHoldsPriority.t .. 2/7 Use of uninitialized value in numeric gt (>) at /kohadevbox/koha/C4/Reserves.pm line 866.
Use of uninitialized value in numeric gt (>) at /kohadevbox/koha/C4/Reserves.pm line 866.
Use of uninitialized value in numeric gt (>) at /kohadevbox/koha/C4/Reserves.pm line 866.
t/db_dependent/Holds/LocalHoldsPriority.t .. 5/7 Use of uninitialized value in numeric gt (>) at /kohadevbox/koha/C4/Reserves.pm line 866.
t/db_dependent/Holds/LocalHoldsPriority.t .. ok
All tests successful.

We didn't have the default values generated by the DBMS

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>