From 254883608912456bc15f57cf282099b8641faf54 Mon Sep 17 00:00:00 2001
From: Tomas Cohen Arazi <tomascohen@theke.io>
Date: Tue, 3 Oct 2017 17:03:54 -0300
Subject: [PATCH] Bug 19370: Remove undefined variable warning

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Signed-off-by: Lari Taskula <lari.taskula@jns.fi>

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
---
 Koha/REST/Plugin/Query.pm | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/Koha/REST/Plugin/Query.pm b/Koha/REST/Plugin/Query.pm
index 32656a401b..45cfe14e7c 100644
--- a/Koha/REST/Plugin/Query.pm
+++ b/Koha/REST/Plugin/Query.pm
@@ -79,11 +79,12 @@ Generates the DBIC order_by attributes based on I<$params>, and merges into I<$a
             my ( $c, $args ) = @_;
             my $attributes = $args->{attributes};
 
-            my @order_by =
-              map { _build_order_atom($_) }
-              split( /\|/, $args->{params}->{_order_by} );
+            if ( defined $args->{params}->{_order_by} ) {
+                my @order_by = map { _build_order_atom($_) }
+                                split( /\|/, $args->{params}->{_order_by} );
+                $attributes->{order_by} = \@order_by;
+            }
 
-            $attributes->{order_by} = \@order_by;
             return $attributes;
         }
     );
-- 
2.39.5