hval: to_filename: return `undef' instead of empty string

[public-inbox.git] / lib / PublicInbox / MboxGz.pm

diff --git a/lib/PublicInbox/MboxGz.pm b/lib/PublicInbox/MboxGz.pm
index fdd16f68e35f91c44131b65de786f8f1037a2a92..967af9c68ad1bf9e4961fbb86aa4ddc1bd2ddee4 100644 (file)
--- a/lib/PublicInbox/MboxGz.pm
+++ b/lib/PublicInbox/MboxGz.pm
@@ -24,8 +24,7 @@ sub mbox_gz {
        $self->{cb} = $cb;
        $self->{base_url} = $self->{-inbox}->base_url($self->{env});
        $self->{gz} = PublicInbox::GzipFilter::gzip_or_die();
-       $fn = to_filename($fn // 'no-subject');
-       $fn = 'no-subject' if $fn eq '';
+       $fn = to_filename($fn // '') // 'no-subject';
        # http://www.iana.org/assignments/media-types/application/gzip
        bless $self, __PACKAGE__;
        my $res_hdr = [ 'Content-Type' => 'application/gzip',