Merge branch '3.3' into 3.4

* 3.3:
  Display a nice error message if the form/serializer component is missing.
  Force phpunit-bridge update (bis)
  [Bridge/PhpUnit] Fix disabling global state preservation

Author: nicolas-grekas

DependencyInjection/FrameworkExtension.php

@@ -178,10 +178,6 @@ public function load(array $configs, ContainerBuilder $container)
                 throw new LogicException('Translation support cannot be enabled as the Translation component is not installed.');
             }
 
-            if (!class_exists('Symfony\Component\Translation\Translator') && $this->isConfigEnabled($container, $config['validation'])) {
-                throw new LogicException('Validation support cannot be enabled as the Translation component is not installed.');
-            }
-
             if (class_exists(Translator::class)) {
                 $loader->load('identity_translator.xml');
             }
@@ -232,6 +228,10 @@ public function load(array $configs, ContainerBuilder $container)
         }
 
         if ($this->isConfigEnabled($container, $config['form'])) {
+            if (!class_exists('Symfony\Component\Form\Form')) {
+                throw new LogicException('Form support cannot be enabled as the Form component is not installed.');
+            }
+
             $this->formConfigEnabled = true;
             $this->registerFormConfiguration($config, $container, $loader);
 
@@ -279,6 +279,10 @@ public function load(array $configs, ContainerBuilder $container)
         $this->registerPropertyAccessConfiguration($config['property_access'], $container, $loader);
 
         if ($this->isConfigEnabled($container, $config['serializer'])) {
+            if (!class_exists('Symfony\Component\Serializer\Serializer')) {
+                throw new LogicException('Serializer support cannot be enabled as the Serializer component is not installed.');
+            }
+
             $this->registerSerializerConfiguration($config['serializer'], $container, $loader);
         }