[PATCH 2/2] www_listing: fix odd "locate inbox" cases

[Eric Wong <e@80x24.org>]

Searching inboxes with an empty query no longer gives 500 errors
due to Xapian.  Also, improve the error message when no inboxes
match, since saying no inboxes exist yet is wrong.
---
 lib/PublicInbox/WwwListing.pm |  7 ++++++-
 t/extindex-psgi.t             | 10 ++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/lib/PublicInbox/WwwListing.pm b/lib/PublicInbox/WwwListing.pm
index eabda98a..1bb5fbd0 100644
--- a/lib/PublicInbox/WwwListing.pm
+++ b/lib/PublicInbox/WwwListing.pm
@@ -96,7 +96,8 @@ sub add_misc_ibx { # MiscSearch->retry_reopen callback
 
 	delete $ctx->{-list}; # reset if retried
 	my $pi_cfg = $ctx->{www}->{pi_cfg};
-	if (defined(my $user_query = $q->{'q'})) {
+	my $user_query = $q->{'q'} // '';
+	if ($user_query =~ /\S/) {
 		$qs = "( $qs ) AND ( $user_query )";
 	} else { # special case for ALL
 		$ctx->ibx_entry($pi_cfg->ALL // die('BUG: ->ALL expected'), {});
@@ -218,6 +219,10 @@ sub psgi_triple {
 		$gzf->zmore('<pre>');
 		$gzf->zmore(join("\n", @$list));
 		$gzf->zmore(mset_footer($ctx, $mset)) if $mset;
+	} elsif (my $mset = delete $ctx->{-mset}) {
+		$gzf->zmore(mset_nav_top($ctx, $mset));
+		$gzf->zmore('<pre>no matching inboxes');
+		$gzf->zmore(mset_footer($ctx, $mset));
 	} else {
 		$gzf->zmore('<pre>no inboxes, yet');
 	}
diff --git a/t/extindex-psgi.t b/t/extindex-psgi.t
index 31b04acd..4e26962e 100644
--- a/t/extindex-psgi.t
+++ b/t/extindex-psgi.t
@@ -59,8 +59,14 @@ my $client = sub {
 	is($res->code, 200, 'all.mbox.gz');
 
 	$res = $cb->(GET('/'));
-	my $html = $res->content;
-	like($html, qr!\Qhttp://bogus.example.com/all\E!, 'html shows /all');
+	like($res->content, qr!\Qhttp://bogus.example.com/all\E!,
+		'/all listed');
+	$res = $cb->(GET('/?q='));
+	is($res->code, 200, 'no query means all inboxes');
+	$res = $cb->(GET('/?q=nonexistent'));
+	is($res->code, 404, 'no inboxes matched');
+	unlike($res->content, qr!no inboxes, yet!,
+		'we have inboxes, just no matches');
 };
 test_psgi(sub { $www->call(@_) }, $client);
 %$env = (%$env, TMPDIR => $tmpdir, PI_CONFIG => $pi_config);