return undef for empty tags

diff --git a/star2016-contributions.pl b/star2016-contributions.pl
index d223129..b11aee8 100755 (executable)
--- a/star2016-contributions.pl
+++ b/star2016-contributions.pl
@@ -98,7 +98,8 @@ sub enc {
 }
 sub l1 {
        my $l = shift;
-       return 'FIXME ref ' . dump($l) if ref $l;
+       #return 'FIXME ref ' . dump($l) if ref $l;
+       return undef if ref $l;
        return enc($l) if $l =~ m/([\x{80}-\x{ff}])/;
        return $l;
 }