Bug 20499: Fix the Internal Server Error ...by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> ...by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Bug 20499: Unit Test toprove the problem ...by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> ...by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Bug 14769:DBRev17.12.00.029 ...by: Jonathan Druart <jonathan.druart@bugs.koha-community.org> ...by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>