[Koha-bugs] [Bug 20696] Remove a few ugly "eq undef" comparisons

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=20696

--- Comment #1 from Marcel de Rooy <m.de.rooy at rijksmuseum.nl> ---
Created attachment 74982
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https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=74982&action=edit
Bug 20696: Fix a few ugly "eq undef" comparisons in Search.pm

Comparisons like $a eq undef should normally raise a warning like:
    Use of uninitialized value in string eq at ...
But unfortunately we still suppress warnings here and there.

Test plan:
[1] Just read this patch and confirm the small changes.
[2] Git grep on "eq undef" and do not find other occurrences.

Signed-off-by: Marcel de Rooy <m.de.rooy at rijksmuseum.nl>

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