Merge branch '2.3' into 2.4

* 2.3: (34 commits)
  Fix #8205 : Deprecate file mode update when calling dumpFile
  Fix #10437: Catch exceptions when reloading a no-cache request
  Fix libxml_use_internal_errors and libxml_disable_entity_loader usage
  removed ini check to make uploadedfile work on gae
  Update OptionsResolver.php
  fixed comment in forms.xml file
  Clean KernelInterface docblocks
  Cast the group name as a string
  Fixed doc of InitAclCommand
  [Form] Fix "Array was modified outside object" in ResizeFormListener.
  Fix IBAN validator
  [Process] Remove unreachable code + avoid skipping tests in sigchild environment
  Fixed bug that incorrectly causes the "required" attribute to be omitted from select even though it contains the "multiple" attribute
  Added travis_retry to .travis.yml
  [Process] fix some typos and refactor some code
  [Process] Fix unit tests in sigchild disabled environment
  [Process] Trow exceptions in case a Process method is supposed to be called after termination
  fixed typo
  [Process] fixed fatal errors in getOutput and getErrorOutput when process was not started
  [Process] Fix escaping on Windows
  ...

Conflicts:
	src/Symfony/Component/DomCrawler/Crawler.php
	src/Symfony/Component/Filesystem/Filesystem.php
	src/Symfony/Component/Process/Process.php

Author: fabpot

Encoder/XmlEncoder.php

@@ -68,6 +68,10 @@ public function encode($data, $format, array $context = array())
      */
     public function decode($data, $format, array $context = array())
     {
+        if ('' === trim($data)) {
+            throw new UnexpectedValueException('Invalid XML data, it can not be empty.');
+        }
+
         $internalErrors = libxml_use_internal_errors(true);
         $disableEntities = libxml_disable_entity_loader(true);
         libxml_clear_errors();
@@ -79,6 +83,8 @@ public function decode($data, $format, array $context = array())
         libxml_disable_entity_loader($disableEntities);
 
         if ($error = libxml_get_last_error()) {
+            libxml_clear_errors();
+
             throw new UnexpectedValueException($error->message);
         }
 

Tests/Encoder/XmlEncoderTest.php

@@ -347,6 +347,12 @@ public function testPreventsComplexExternalEntities()
         }
     }
 
+    public function testDecodeEmptyXml()
+    {
+        $this->setExpectedException('Symfony\Component\Serializer\Exception\UnexpectedValueException', 'Invalid XML data, it can not be empty.');
+        $this->encoder->decode(' ', 'xml');
+    }
+
     protected function getXmlSource()
     {
         return '<?xml version="1.0"?>'."\n".