Merge branch '2.7' into 2.8

* 2.7:
  [FrameworkBundle] Do not load property_access.xml if the component isn't installed
  Fixed a few spelling mistakes in Luxembourgish translation

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -60,9 +60,6 @@ public function load(array $configs, ContainerBuilder $container)
         // will be used and everything will still work as expected.
         $loader->load('translation.xml');
 
-        // Property access is used by both the Form and the Validator component
-        $loader->load('property_access.xml');
-
         $configuration = $this->getConfiguration($configs, $container);
         $config = $this->processConfiguration($configuration, $configs);
 
@@ -126,7 +123,7 @@ public function load(array $configs, ContainerBuilder $container)
         }
 
         $this->registerAnnotationsConfiguration($config['annotations'], $container, $loader);
-        $this->registerPropertyAccessConfiguration($config['property_access'], $container);
+        $this->registerPropertyAccessConfiguration($config['property_access'], $container, $loader);
 
         if (isset($config['serializer'])) {
             $this->registerSerializerConfiguration($config['serializer'], $container, $loader);
@@ -781,8 +778,14 @@ private function registerAnnotationsConfiguration(array $config, ContainerBuilde
         }
     }
 
-    private function registerPropertyAccessConfiguration(array $config, ContainerBuilder $container)
+    private function registerPropertyAccessConfiguration(array $config, ContainerBuilder $container, XmlFileLoader $loader)
     {
+        if (!class_exists('Symfony\Component\PropertyAccess\PropertyAccessor')) {
+            return;
+        }
+
+        $loader->load('property_access.xml');
+
         $container
             ->getDefinition('property_accessor')
             ->replaceArgument(0, $config['magic_call'])
@@ -813,6 +816,11 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
         $loader->load('serializer.xml');
         $chainLoader = $container->getDefinition('serializer.mapping.chain_loader');
 
+        if (!class_exists('Symfony\Component\PropertyAccess\PropertyAccessor')) {
+            $container->removeAlias('serializer.property_accessor');
+            $container->removeDefinition('serializer.normalizer.object');
+        }
+
         $serializerLoaders = array();
         if (isset($config['enable_annotations']) && $config['enable_annotations']) {
             $annotationLoader = new Definition(