[Koha-bugs] [Bug 32262] smart-rules: Some rules can be created but are not visible on interface

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=32262

--- Comment #3 from Jonathan Druart <jonathan.druart+koha at gmail.com> ---
Created attachment 144143
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=144143&action=edit
Bug 32262: Handle non-existing circ rules

Some rules are not displayed on the UI, even if they exist in the DB,
that's confusing.
That's because we are implicitely returning 'undef' from
CirculationRules.Search, and perl returns an empty string for undef in
a string context. Which means "rules.defined" is always true.

This patch is ugly and really hope somebody else will come with a better
solution.

Test plan:
I don't know, search for regressions on the circ rule UI?... :D

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