Closes #6306 - Console\RouteNotFoundStrategy invalid index

Solves an issue where the consoles RouteNotFoundStrategy would throw an exception because an arrays index 0 isn't defined.
That said... I'm adding the following:

```php
$result = $method->invokeArgs($this->strategy, array(array(array()), 1, 0));
$this->assertSame('', $result);
```

so that we at least have an assertion in the test.