From 7a452ac4149809c212d861ee8b08c3931f23234a Mon Sep 17 00:00:00 2001
From: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Date: Mon, 2 May 2016 12:26:44 +0200
Subject: [PATCH] Bug 16412: Cache undef in L1 only

No need to cache undef in L2.
Prevent numerous warnings like:
Use of uninitialized value in subroutine entry at /usr/share/koha/masterclone/Koha/Cache.pm line 284

Test plan:
Run t/Cache.t
Run t/db_dependent/sysprefs.t

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Amended patch: remove trailing space char and replace 'you' with 'we' to
match existing wordings.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Jesse Weaver <jweaver@bywatersolutions.com>
---
 Koha/Cache.pm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Koha/Cache.pm b/Koha/Cache.pm
index 6f10b00dbf..6b41e3c0a5 100644
--- a/Koha/Cache.pm
+++ b/Koha/Cache.pm
@@ -271,10 +271,11 @@ sub set_in_cache {
     # Deep copy if it's not a scalar and unsafe is not passed
     $value = dclone( $value ) if ref($value) and not $unsafe;
 
-    # Set in L1 cache
+    # Set in L1 cache; exit if we are caching an undef
     $L1_cache{ $key } = $value;
+    return if !defined $value;
 
-    # We consider an expiry of 0 to be inifinite
+    # We consider an expiry of 0 to be infinite
     if ( $expiry ) {
         return $set_sub
           ? $set_sub->( $key, $value, $expiry )
-- 
2.39.5