minor #13232 [TwigBundle] always load the exception listener if the templating.engines is not present (fabpot)

This PR was merged into the 2.7 branch.

Discussion
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[TwigBundle] always load the exception listener if the templating.engines is not present

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | fixes #11876 partially
| License       | MIT
| Doc PR        | n/a

This PR removes (partially) the dependency of TwigBundle on FrameworkBundle. If FrameworkBundle is not registered, the Twig exception listener is always registered (this change was part of #13143 but as it is now totally independent, I've created a new PR).

Commits
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30ba9df [TwigBundle] always load the exception listener if the templating.engines is not present

Author: fabpot

DependencyInjection/Compiler/ExceptionListenerPass.php

@@ -28,9 +28,11 @@ public function process(ContainerBuilder $container)
         }
 
         // register the exception controller only if Twig is enabled
-        $engines = $container->getParameter('templating.engines');
-        if (!in_array('twig', $engines)) {
-            $container->removeDefinition('twig.exception_listener');
+        if ($container->hasParameter('templating.engines')) {
+            $engines = $container->getParameter('templating.engines');
+            if (!in_array('twig', $engines)) {
+                $container->removeDefinition('twig.exception_listener');
+            }
         }
     }
 }