gitweb: omit the repository owner when it is unset

On the repository summary page, leave the owner line out if the
repo does not have an owner, rather than displaying a labelled empty
field. This does not affect the owner column in the projects list
page, which is present unless $omit_owner is true.

Signed-off-by: Tony Finch <dot@dotat.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

gitweb/gitweb.perl

@@ -6463,7 +6463,7 @@ sub git_summary {
 	print "<div class=\"title\">&nbsp;</div>\n";
 	print "<table class=\"projects_list\">\n" .
 	      "<tr id=\"metadata_desc\"><td>description</td><td>" . esc_html($descr) . "</td></tr>\n";
-        unless ($omit_owner) {
+        if ($owner and not $omit_owner) {
 	        print  "<tr id=\"metadata_owner\"><td>owner</td><td>" . esc_html($owner) . "</td></tr>\n";
         }
 	if (defined $cd{'rfc2822'}) {