Bug 12357: Fix comma issues related to additional fields.

Bug 12357: Fix comma issues related to additional fields.

TEST PLAN
---------
1) Apply patches, except this one.
2) prove t/db_dependent/Record.t
   -- fails like comment #38
3) Apply this patch
4) prove t/db_dependent/Record.t
   -- now it passes.
5) koha qa test tools.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Make test work, koha-qa problems fixed in next patch

Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>