Bug 36937: Remove warning from unit tests

Bug 36937: Remove warning from unit tests

This patch fixes a warning in the unit tests

Test plan:
1) prove t/db_dependent/api/v1/password_validation.t
2) There will be a warning in the output - 'Use of uninitialized value $status in numeric eq (==)'
3) Apply patch
4) Re-run the test
5) The warning will disappear

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>