options subroutines have to return something optionable.

lib/WebGUI/Asset/Template.pm

@@ -67,6 +67,7 @@ property parser => (
                  for my $class ( @{$session->config->get('templateParsers')} ) {
                      $parsers{$class} = $self->getParser($session, $class)->getName();
                  }
+                 return \%parsers;
              },
          );
 sub _default_parser {