bug #18934 Fixed some issues of the AccessDecisionManager profiler (javiereguiluz)

This PR was squashed before being merged into the 3.1 branch (closes #18934).

Discussion
----------

Fixed some issues of the AccessDecisionManager profiler

| Q             | A
| ------------- | ---
| Branch?       | 3.1
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #19022 https://github.com/symfony/symfony-standard/issues/968 schmittjoh/JMSSecurityExtraBundle#207
| License       | MIT
| Doc PR        | -

Commits
-------

082f1b5 Fixed some issues of the AccessDecisionManager profiler

Author: fabpot

Core/Authorization/DebugAccessDecisionManager.php

@@ -26,17 +26,19 @@ class DebugAccessDecisionManager implements AccessDecisionManagerInterface
 {
     private $manager;
     private $strategy;
-    private $voters;
+    private $voters = array();
     private $decisionLog = array();
 
-    public function __construct(AccessDecisionManager $manager)
+    public function __construct(AccessDecisionManagerInterface $manager)
     {
         $this->manager = $manager;
 
-        // The strategy is stored in a private property of the decorated service
-        $reflection = new \ReflectionProperty($manager, 'strategy');
-        $reflection->setAccessible(true);
-        $this->strategy = $reflection->getValue($manager);
+        if ($this->manager instanceof AccessDecisionManager) {
+            // The strategy is stored in a private property of the decorated service
+            $reflection = new \ReflectionProperty(AccessDecisionManager::class, 'strategy');
+            $reflection->setAccessible(true);
+            $this->strategy = $reflection->getValue($manager);
+        }
     }
 
     /**
@@ -60,6 +62,10 @@ public function decide(TokenInterface $token, array $attributes, $object = null)
      */
     public function setVoters(array $voters)
     {
+        if (!$this->manager instanceof AccessDecisionManager) {
+            return;
+        }
+
         $this->voters = $voters;
         $this->manager->setVoters($voters);
     }
@@ -72,7 +78,7 @@ public function getStrategy()
         // The $strategy property is misleading because it stores the name of its
         // method (e.g. 'decideAffirmative') instead of the original strategy name
         // (e.g. 'affirmative')
-        return strtolower(substr($this->strategy, 6));
+        return null === $this->strategy ? '-' : strtolower(substr($this->strategy, 6));
     }
 
     /**