Bug 24272: (follow-up) Test defined not true

Bug 24272: (follow-up) Test defined not true

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit a9ea5d1ba42d8d0bbf3f8ad01e22521f20efdd38)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit a8f2eaa7958f595e549b91d162ee6d8320ff12ed)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
(cherry picked from commit da8aae4d65716f066af784cd60e9c8784d954dbe)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>