Merge branch '1.x' into 2.x

* 1.x:
  Don't clear PHP buffer when an error occurs with debug=true
  Remove duplicate phpdoc

src/Node/SpacelessNode.php

@@ -33,7 +33,13 @@ class SpacelessNode extends Node implements NodeOutputInterface
     {
         $compiler
             ->addDebugInfo($this)
-            ->write("ob_start(function () { return ''; });\n")
+        ;
+        if ($compiler->getEnvironment()->isDebug()) {
+            $compiler->write("ob_start();\n");
+        } else {
+            $compiler->write("ob_start(function () { return ''; });\n");
+        }
+        $compiler
             ->subcompile($this->getNode('body'))
             ->write("echo trim(preg_replace('/>\s+</', '><', ob_get_clean()));\n")
         ;