minor symfony#22427 [PropertyInfo] Remove a useless call to count() in SerializerExtractor (dunglas)

This PR was merged into the 2.8 branch.

Discussion
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[PropertyInfo] Remove a useless call to count() in SerializerExtractor

| Q             | A
| ------------- | ---
| Branch?       |  2.8 <!-- see comment below -->
| Bug fix?      | no
| New feature?  | no <!-- don't forget updating src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget updating UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Commits
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7a8a72d [PropertyInfo] Remove a useless call to count() in SerializerExtractor

Author: fabpot

src/Symfony/Component/PropertyInfo/Extractor/SerializerExtractor.php

@@ -48,7 +48,7 @@ public function getProperties($class, array $context = array())
         $serializerClassMetadata = $this->classMetadataFactory->getMetadataFor($class);
 
         foreach ($serializerClassMetadata->getAttributesMetadata() as $serializerAttributeMetadata) {
-            if (count(array_intersect($context['serializer_groups'], $serializerAttributeMetadata->getGroups())) > 0) {
+            if (array_intersect($context['serializer_groups'], $serializerAttributeMetadata->getGroups())) {
                 $properties[] = $serializerAttributeMetadata->getName();
             }
         }