Fix error empty route name

[makoso]

Fix error on requests that cannot access requested _route

[DonCallisto]

Hi,
could you explain this? When _route is not available?

[makoso]

Hi @DonCallisto

I get this error when i need grid on page that has route parameters and grid isnt returned by gridGet reponse, because ineed more that one grid on this page i return it like this example:

1. Create grid
2. fire method isReadyForRedirect()
3. assign to the template
4. standard render it:
   {{ grid(contactPersons, 'APYDataGridBundle::blocks_js.jquery.html.twig') }}

if i dont have this changes i get error unable to generate route for name ""(empty) or in some times i get error of missing parameters to gereate route for current request (i use ajax)
after this fix #967 i get good grid displayed but no working filtering because there is same problem, request dosnt contains all parameters see #968

Maybe is better to check it in constructor?

Regards.

[DonCallisto]

Sorry but I don't understand your use case. Do you have multiple grid on the same page?
If page is the same, _route and other things should continue to work as expected.
Can you isolate the problem in a repository so we can see exactly what's going on? To me is just strange that no route is setted.

[b-enoit-be]

@DonCallisto this actually happens on forwarded routes.

Fabien Potencier actually explained here that _route should not be used because it is only for debugging purpose.

[b-enoit-be]

In a similar issue, I did resolve it using the RequestStack instead:

/** @var Symfony\Component\HttpFoundation\RequestStack $requestStack -- can be DI'ed */
$gridManager->createGrid()
            ->setSource($source)
            ->setRouteUrl($requestStack->getMasterRequest()->getPathInfo());

[DonCallisto]

That makes sense but we should think how to solve this natively.
I'll take a look when I have time otherwise feel free to open a PR.