search: support Subject:-less messages

Some mailing lists allow empty Subject headers and we shall support
searching and indexing them.

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index bf50365a..3a908ac6 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -107,12 +107,15 @@ sub get_thread {
 
         return { total => 0, msgs => [] } unless $smsg;
         my $qtid = Search::Xapian::Query->new(xpfx('thread').$smsg->thread_id);
-        my $path = id_compress($smsg->path);
-        my $qsub = Search::Xapian::Query->new(xpfx('path').$path);
-        my $query = Search::Xapian::Query->new(OP_OR, $qtid, $qsub);
+        my $path = $smsg->path;
+        if (defined $path && $path ne '') {
+                my $path = id_compress($smsg->path);
+                my $qsub = Search::Xapian::Query->new(xpfx('path').$path);
+                $qtid = Search::Xapian::Query->new(OP_OR, $qtid, $qsub);
+        }
         $opts ||= {};
         $opts->{limit} ||= 1000;
-        _do_enquire($self, $query, $opts);
+        _do_enquire($self, $qtid, $opts);
 }
 
 sub _do_enquire {