[TwigBundle] Handle Exception during twig rendering

An Exception can be throw by twig during rendering an other exception (i.e. when using is_granted()).
This exception was not caught, and non-secure data were sent to the client.
With this commit, we fallback to a secure HTML file

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT
| Doc PR        |