www: do not warn on blank query parameters

Sometimes users (or bots) may lead queries with '&' and
trigger uninitialized variable warnings, just ignore them
and give consumers a $ctx->{qp}->{''} entry.

While we're in the area, pass a regexp rather than scalar string
to the `split' perlop to prevent Perl from recompiling the
regexp on every call.

1 files changed, 4 insertions, 0 deletions

diff --git a/t/psgi_search.t b/t/psgi_search.t
index d59e439b..5bdd66ed 100644
--- a/t/psgi_search.t
+++ b/t/psgi_search.t
@@ -88,6 +88,10 @@ test_psgi(sub { $www->call(@_) }, sub {
         is($res->code, 200, 'successful search result');
         is_deeply([], $warn, 'no warnings from non-numeric comparison');
 
+        $res = $cb->(GET('/test/?&q=s:test'));
+        is($res->code, 200, 'successful search result');
+        is_deeply([], $warn, 'no warnings from black parameter');
+
         $res = $cb->(POST('/test/?q=s:bogus&x=m'));
         is($res->code, 404, 'failed search result gives 404');
         is_deeply([], $warn, 'no warnings');