From 9237f0f88f1bce9d043c10df7d15d62ed1e1ee59 Mon Sep 17 00:00:00 2001
From: Dominique Dumont <dod@debian.org>
Date: Thu, 12 Oct 2017 19:28:30 +0200
Subject: [PATCH] HashId: do not notify when deleting an undef value (Debian
 #876967)

Thanks to Thomas Schmitt for the report
---
 lib/Config/Model/AnyId.pm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Config/Model/AnyId.pm b/lib/Config/Model/AnyId.pm
index be5366ad6..85859bcaf 100644
--- a/lib/Config/Model/AnyId.pm
+++ b/lib/Config/Model/AnyId.pm
@@ -949,7 +949,8 @@ sub delete {
 
     delete $self->{warning_hash}{$idx};
     my $ret = $self->_delete($idx);
-    $self->notify_change( note => "deleted entry $idx" );
+    # notification is not needed if the value was already delete or missing
+    $self->notify_change( note => "deleted entry $idx" ) if defined $ret;
     return $ret;
 }