Bug 12861 : Noisy warn in the error logs

Bug 12861 : Noisy warn in the error logs

To test
Hit a url like
cgi-bin/koha/opac-authorities-home.pl?op=do_search&type=opac&operatorc=contains&marclistc=mainentry&and_orc=and&orderby=HeadingAsc&value=FIRECLAY

Notice the warns in the error log
Apply patch
Reload the url
Still works but no warns

(cherry picked from commit c98d805e490a82b2ea9f3d4e0f7278640942ba6d)
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Reformatted to fix error M Tompsett spotted

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Instead of 10 warnings, I now have only 4 warnings.
We're going in the right direction.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>