Merge branch '6.4' into 7.2

* 6.4:
  [Config] Do not generate unreachable configuration paths
  [WebProfilerBundle] Fix missing indent on non php files opended in the profiler

Author: fabpot

Tests/Fixtures/hello_world.json

@@ -0,0 +1,4 @@
+[
+  "Hello",
+  "World!"
+]

Tests/Fixtures/hello_world.php

@@ -0,0 +1,4 @@
+<?php
+
+echo 'Hello';
+echo 'World!';