From 4de1d388b935676a2504a3ad6e31b38362cb5df9 Mon Sep 17 00:00:00 2001
From: Jared Johnson <jjohnson@efolder.net>
Date: Fri, 5 Dec 2014 11:31:59 -0600
Subject: [PATCH] Silence a warning in plugins/greylisting

---
 plugins/greylisting | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/greylisting b/plugins/greylisting
index b00bc03..efd5792 100644
--- a/plugins/greylisting
+++ b/plugins/greylisting
@@ -346,7 +346,7 @@ sub greylist {
     $self->log(LOGDEBUG,
                "config: "
                  . join(',',
-                        map { $_ . '=' . $config->{$_} } sort keys %$config)
+                        map { $_ . '=' . (defined $config->{$_} ? $config->{$_} : '') } sort keys %$config)
               );
 
     return DECLINED if $self->exclude();