Bug 23712: Silence warns from Koha/Illrequest/Logger.pm

Bug 23712: Silence warns from Koha/Illrequest/Logger.pm

To test:
- Run: $ sudo koha-shell -c "prove t/db_dependent/Illrequests.t" kohadev
- Observe the warnings about "no query in themelanguage"
- Apply the patch
- Run prove again
- Observe the lack of warnings about "no query in themelanguage"
  (There will be a couple of other warnings, but they are not
  related to the present bug.)

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>