www+nntp: deal with lack of addresses for ->ALL

Since extindex is an amalgamation of several inboxes, discerning
an appropriate address for List-Post: would be expensive and
most likely unnecessary.  Some legacy/historical inboxes may
have no active address, either, so don't attempt to set the
List-Post header if no addresses are configured.

1 files changed, 5 insertions, 4 deletions

diff --git a/lib/PublicInbox/WwwStream.pm b/lib/PublicInbox/WwwStream.pm
index 34e12435..66e34a12 100644
--- a/lib/PublicInbox/WwwStream.pm
+++ b/lib/PublicInbox/WwwStream.pm
@@ -143,10 +143,10 @@ EOF
         }
 
         $urls .= "\n" . join('', map { "\tgit clone --mirror $_\n" } @urls);
-        my $addrs = $ibx->{address};
-        $addrs = join(' ', @$addrs) if ref($addrs) eq 'ARRAY';
-        my $v = defined $max ? '-V2' : '-V1';
-        $urls .= <<EOF;
+        if (my $addrs = $ibx->{address}) {
+                $addrs = join(' ', @$addrs) if ref($addrs) eq 'ARRAY';
+                my $v = defined $max ? '-V2' : '-V1';
+                $urls .= <<EOF;
 
         # If you have public-inbox 1.1+ installed, you may
         # initialize and index your mirror using the following commands:
@@ -154,6 +154,7 @@ EOF
                 $addrs
         public-inbox-index $dir
 EOF
+        }
         my $cfg_link = ($ctx->{-upfx} // '').'_/text/config/raw';
         $urls .= <<EOF;