bug #2163 default implementation of getDebugInfo() for BC (xabbuh)

This PR was merged into the 1.x branch.

Discussion
----------

default implementation of getDebugInfo() for BC

eZ updated the code on their side in the meantime (see ezsystems/LegacyBridge#63), but there may be other projects doing similar things (fixes #2129 (comment)).

Commits
-------

7b4cfdb default implementation of getDebugInfo() for BC

lib/Twig/Template.php

@@ -49,7 +49,10 @@ abstract public function getTemplateName();
      *
      * @internal
      */
-    abstract public function getDebugInfo();
+    public function getDebugInfo()
+    {
+        return array();
+    }
 
     /**
      * Returns the template source code.