Merge branch '3.4' into 4.4

* 3.4:
  [Phpunit] Fix running skipped tests expecting only deprecations
  [DependencyInjection] #35505 Fix typo in test name
  [Yaml][Inline] Fail properly on empty object tag and empty const tag
  Check non-null type for numeric type
  Check value isset to avoid PHP notice
  bug symfony#28179 [DomCrawler] Skip disabled fields processing in Form

Author: nicolas-grekas

Tests/ContainerBuilderTest.php

@@ -1097,7 +1097,7 @@ public function testThrowsExceptionWhenSetServiceOnACompiledContainer()
         $container->set('a', new \stdClass());
     }
 
-    public function testThrowsExceptionWhenAddServiceOnACompiledContainer()
+    public function testNoExceptionWhenAddServiceOnACompiledContainer()
     {
         $container = new ContainerBuilder();
         $container->compile();