Merge branch '3.2' into 3.3

* 3.2:
  fixed tests
  swiftmailer bridge is gone
  [TwigBundle] add back exception check
  Dont call count on non countable object
  Fix undefined variable $filesystem

Author: fabpot

Command/AssetsInstallCommand.php

@@ -158,7 +158,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         // remove the assets of the bundles that no longer exist
         foreach (new \FilesystemIterator($bundlesDir) as $dir) {
             if (!in_array($dir, $validAssetDirs)) {
-                $filesystem->remove($dir);
+                $this->filesystem->remove($dir);
             }
         }