From a036bff0f318b16eab4d9ba3a5ff5794b0b6a111 Mon Sep 17 00:00:00 2001
From: justme-1968 <justme-1968@users.noreply.github.com>
Date: Sat, 1 Feb 2014 23:05:06 +0000
Subject: [PATCH] fixed waring for undef valueFormat {...}

git-svn-id: https://svn.fhem.de/fhem/trunk/fhem@4784 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 FHEM/33_readingsGroup.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/FHEM/33_readingsGroup.pm b/FHEM/33_readingsGroup.pm
index a1451f99b..dc291c946 100644
--- a/FHEM/33_readingsGroup.pm
+++ b/FHEM/33_readingsGroup.pm
@@ -217,6 +217,8 @@ lookup2($$$$)
     $lookup = "" if( $@ );
   }
 
+  return $lookup if( !defined($lookup) );
+
   $lookup =~ s/\%DEVICE/$name/g;
   $lookup =~ s/\%READING/$reading/g;
   $lookup =~ s/\%VALUE/$value/g;