Bug 36212: Add check on barcode before searching items

Bug 36212: Add check on barcode before searching items

Test plan:
Add an item to your database that has no barcode.
Run t/db_dependent/Circulation.t
It will fail without this patch, pass with this patch.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 8413b376798097725cfd2ca3eb7a12427ad08163)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 246566b7d1bc275e946860e950692216fbafc871)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>