[PATCH] mbox: do not try to create filename from empty string

[Eric Wong]

This was causing warnings to pop up in syslogs for messages with
empty Subject headers.
---
 lib/PublicInbox/Mbox.pm   | 2 +-
 lib/PublicInbox/MboxGz.pm | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/PublicInbox/Mbox.pm b/lib/PublicInbox/Mbox.pm
index 42cedd15..c50a118b 100644
--- a/lib/PublicInbox/Mbox.pm
+++ b/lib/PublicInbox/Mbox.pm
@@ -18,7 +18,7 @@ use Email::MIME::Encode;
 sub subject_fn ($) {
        my ($hdr) = @_;
        my $fn = $hdr->header('Subject');
-       return 'no-subject' unless defined($fn);
+       return 'no-subject' if (!defined($fn) || $fn eq '');
 
        # no need for full Email::MIME, here
        if ($fn =~ /=\?/) {
diff --git a/lib/PublicInbox/MboxGz.pm b/lib/PublicInbox/MboxGz.pm
index 1621cff8..ef560426 100644
--- a/lib/PublicInbox/MboxGz.pm
+++ b/lib/PublicInbox/MboxGz.pm
@@ -23,7 +23,7 @@ sub response {
        my $body = $class->new($ctx, $cb);
        # http://www.iana.org/assignments/media-types/application/gzip
        my @h = qw(Content-Type application/gzip);
-       if ($fn) {
+       if (defined $fn && $fn ne '') {
                $fn = to_filename($fn);
                push @h, 'Content-Disposition', "inline; filename=$fn.mbox.gz";
        }
--
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