Bug 22696: Simplify visibility logic in opac-ISBDdetail.pl
This patch removes many DB queries and uses state-of-the-art Koha code
to accomplish the same things it did before.
To test:
- Apply this patch
- Open opac-ISBDdetail.pl for a known record
=> SUCCESS: No behaviour change.
- Sign off :-D
Signed-off-by: Bin Wen <bin.wen@inlibro.com> Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com> Signed-off-by: Nick Clemens <nick@bywatersolutions.com>