[Catalyst] $c->forward return stuff

[fayland]

is it a bug?
my code are as follows:

# common validate
sub validate : Private {
    my ( $self, $c, $input ) = @_;
    my $error;
    $error->{title} = 'required' unless ($input->{title});
    <snip> # this place we need $c, so we use "Private" instead normal sub
    return $error;
}

# in another Controller
my $error = $c->forward('validate', [ { title => $title, ... } ] );
$error->{another} = '..' unless .. # special validate
$c->stash->{error} = $error;

NOW we have problem. Assuming that the validate sub return "$error" is 
undef, that "in another Controller" my $error would be "0". and 
*$error->{another}* would complain. I dig into the code and find that:

Catalyst.pm 1121
    eval { $c->state( &$code( $class, $c, @{ $c->req->args } ) || 0 ) };

is it a correct return?

ok I know I can set my $error = { }; in the validate sub. but I just 
doubt that why there is a "|| 0" needed.

thanks.

-- 
Fayland Lam // http://www.fayland.org/