[Routing] Fixing 'Creating the Route Provider' example

[yceruto]

Q	A
Doc fix?	yes
New docs?	no
Applies to	all
Fixed tickets	n/a

Customizing the Dynamic Router > Using a Custom Route Provider > Creating the Route Provider > getRouteByName method link:

/**
 * This method is used to generate URLs, e.g. {{ path('foobar') }}.
 */
public function getRouteByName($name, $params = array())
{
    $document = $this->findOneBy(array(
        'name' => $name,
    ));

    // <--- missing RouteNotFoundException if $document is null

    if ($route) { // <--- undefined variable $route
        $route = new SymfonyRoute($route->getPattern(), array( // <--- undefined variable $route
            'document' => $document,
        ));
    }

    return $route;
}

[dbu]

seems we did not check good enough what we whre explaining here. thanks for fixing these mistakes!