Bug 11934 - Replace given by if-else statements

Bug 11934 - Replace given by if-else statements

To test:

[1] Verify that prove -v t/db_dependent/Circulation_issuingrules.t
    passes.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
replaces given-when with if-elsif-else constructs.
Tests still pass and code looks good.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 12df62ca33047df0c5cd372bf5574cf131f773e0)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>