Merge branch '2.7' into 2.8

* 2.7:
  always check for all fields to be mapped
  clarify exception when no args are configured
  [PropertyAccess] Handle interfaces in the invalid argument exception
  [Debug] Workaround "null" $context
  [Debug] Remove $context arg from handleError(), preparing for PHP 7.2
  [Routing] Fix BC break in AnnotationClassLoader defaults attributes handling
  Fix tests with ICU 57.1
  Fix the condition checking the minimum ICU version

Author: fabpot

Util/IntlTestHelper.php

@@ -41,7 +41,7 @@ public static function requireIntl(\PHPUnit_Framework_TestCase $testCase, $minim
         //   * the intl extension is loaded with version Intl::getIcuStubVersion()
         //   * the intl extension is not loaded
 
-        if (($minimumIcuVersion || defined('HHVM_VERSION_ID')) && IcuVersion::compare(Intl::getIcuVersion(), $minimumIcuVersion, '!=', 1)) {
+        if (($minimumIcuVersion || defined('HHVM_VERSION_ID')) && IcuVersion::compare(Intl::getIcuVersion(), $minimumIcuVersion, '<', 1)) {
             $testCase->markTestSkipped('ICU version '.$minimumIcuVersion.' is required.');
         }