nntpd: skip inboxes w/o {newsgroup}

So we don't trigger an uninitialized variable warning :x

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/PublicInbox/NNTPD.pm b/lib/PublicInbox/NNTPD.pm
index 953228d0..7f9a1d58 100644
--- a/lib/PublicInbox/NNTPD.pm
+++ b/lib/PublicInbox/NNTPD.pm
@@ -38,8 +38,8 @@ sub refresh_groups {
         my $groups = $pi_cfg->{-by_newsgroup}; # filled during each_inbox
         $pi_cfg->each_inbox(sub {
                 my ($ibx) = @_;
-                my $ngname = $ibx->{newsgroup};
-                if (defined($ngname) && $ibx->nntp_usable) {
+                my $ngname = $ibx->{newsgroup} // return;
+                if ($ibx->nntp_usable) {
                         # only valid if msgmap and over works
                         # preload to avoid fragmentation:
                         $ibx->description;