Bug 15578: Make sure all params will be taken into account when instantiating

Bug 15578: Make sure all params will be taken into account when instantiating

The tests in t/db_dependent/Koha_Authority.t expects at least 1
authority record in the DB to run them, otherwise they are skipped.
On our integration server, the DB does not contain any records, and the
tests are skipped.
Unfortunately these tests were testing the authid method of
Koha::MetadataRecord::Authority.

Test plan:
Apply the first patch, launch tests
=> Fail
Apply the second patch, launch tests
=> \o/

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>