It should be used like this:

    my $productIterator = WebGUI::Asset::Product->getIsa($session);
    ASSET: while (1) {
        my $product = eval { $productIterator->() };
        if (my $e = Exception::Class->caught()) {
            $session->log->error($@);
            next ASSET;
        }
        last ASSET unless $product;
        ##Do something useful with $product
    }