bug #23024 [EventDispatcher] Fix ContainerAwareEventDispatcher::hasLi…

…steners(null) (nicolas-grekas)

This PR was merged into the 2.7 branch.

Discussion
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[EventDispatcher] Fix ContainerAwareEventDispatcher::hasListeners(null)

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

e7c4149 [EventDispatcher] Fix ContainerAwareEventDispatcher::hasListeners(null)

src/Symfony/Component/EventDispatcher/ContainerAwareEventDispatcher.php

@@ -105,7 +105,7 @@ public function removeListener($eventName, $listener)
     public function hasListeners($eventName = null)
     {
         if (null === $eventName) {
-            return (bool) count($this->listenerIds) || (bool) count($this->listeners);
+            return $this->listenerIds || $this->listeners || parent::hasListeners();
         }
 
         if (isset($this->listenerIds[$eventName])) {

src/Symfony/Component/EventDispatcher/Tests/AbstractEventDispatcherTest.php

@@ -56,6 +56,7 @@ public function testAddListener()
     {
         $this->dispatcher->addListener('pre.foo', array($this->listener, 'preFoo'));
         $this->dispatcher->addListener('post.foo', array($this->listener, 'postFoo'));
+        $this->assertTrue($this->dispatcher->hasListeners());
         $this->assertTrue($this->dispatcher->hasListeners(self::preFoo));
         $this->assertTrue($this->dispatcher->hasListeners(self::postFoo));
         $this->assertCount(1, $this->dispatcher->getListeners(self::preFoo));