Bug 35843: Correct invalid exception

Bug 35843: Correct invalid exception

Test plan:
Run background job tests. Especially the changed one.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Magnus Enger <magnus@libriotech.no>
All test pass when running this:
prove t/db_dependent/Koha/BackgroundJobs*
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 291268f3185cb48b6498a9d9121d9567bc0d3419)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>