Bug 23027: Make Suggestions.t pass even if no biblio in DB

Bug 23027: Make Suggestions.t pass even if no biblio in DB

There are biblionumbers 1 and 2 hardcoded

Test plan:
MariaDB [koha_kohadev]> delete from biblioitems; delete from items; delete from biblio;
% prove t/db_dependent/Suggestions.t
Must return green with this patch applied

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit e825751cda6a920aa2455908970a3f8e85c1a4e8)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>