[Koha-bugs] [Bug 41060] Add a value_builder to check if ISSN is valid

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=41060 --- Comment #15 from Marcel de Rooy <m.de.rooy@rijksmuseum.nl> --- Created attachment 191560 --> https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=191560&action=edit Bug 41060: (QA follow-up) Consistent return for empty string An empty ISBN should not warn just like an empty ISSN. Test plan: Verify that clearing ISBN or ISSN does not warn anymore. Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl> -- You are receiving this mail because: You are watching all bug changes.