33_readingsGroup.pm: fixed uninitialized value warning

git-svn-id: https://svn.fhem.de/fhem/trunk@8227 2b470e98-0d58-463d-a4d8-8e2adae1ed80
2015-03-16 20:08:03 +00:00
parent 0ed0b568f3
commit 8a4d617c63
1 changed files with 2 additions and 0 deletions
--- a/fhem/FHEM/33_readingsGroup.pm
+++ b/fhem/FHEM/33_readingsGroup.pm
@@ -336,6 +336,8 @@ lookup2($$$$;$$)
    $lookup = $vf;
  }

+  return undef if( !defined($lookup) );
+
  if( !ref($lookup) && $lookup =~ m/^{.*}$/) {
    my $DEVICE = $name;
    my $READING = $reading;