bug symfony#11232 [Routing] Fixes fatal errors with object resources in AnnotationDirectoryLoader::supports (Tischoi)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes symfony#11232).

Discussion
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[Routing] Fixes fatal errors with object resources in AnnotationDirectoryLoader::supports

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Fixes fatal errors that occur in the supports method with objects that aren't string convertible / don't implement ArrayAccess. This is mostly a problem because some locators try to access a specific character in the resource name.
Since the resource is checked if it's a string either way, it's the most simple solution to just move that check a bit ahead.

Commits
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5e80585 Update AnnotationDirectoryLoader.php

Author: fabpot

src/Symfony/Component/Routing/Loader/AnnotationDirectoryLoader.php

@@ -66,12 +66,16 @@ public function load($path, $type = null)
      */
     public function supports($resource, $type = null)
     {
+        if (!is_string($resource)) {
+            return false;
+        }
+        
         try {
             $path = $this->locator->locate($resource);
         } catch (\Exception $e) {
             return false;
         }
 
-        return is_string($resource) && is_dir($path) && (!$type || 'annotation' === $type);
+        return is_dir($path) && (!$type || 'annotation' === $type);
     }
 }