From 1cfc1b7fe71732e81923ab93f32ca7f82831cbed Mon Sep 17 00:00:00 2001
From: Christian Flothmann <christian.flothmann@xabbuh.de>
Date: Tue, 13 Jan 2015 20:43:24 +0100
Subject: [PATCH] exit when Twig environment is not set

The `DebugCommand` from the TwigBridge requires the `Twig_Environment`
to be set. Thus, if the `setTwigEnvironment()` were not called, the
command execution would have been aborted with a PHP error.
---
 src/Symfony/Bridge/Twig/Command/DebugCommand.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Symfony/Bridge/Twig/Command/DebugCommand.php b/src/Symfony/Bridge/Twig/Command/DebugCommand.php
index bb81615a6c..27482e732c 100644
--- a/src/Symfony/Bridge/Twig/Command/DebugCommand.php
+++ b/src/Symfony/Bridge/Twig/Command/DebugCommand.php
@@ -83,6 +83,13 @@ EOF
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         $twig = $this->getTwigEnvironment();
+
+        if (null === $twig) {
+            $output->writeln('<error>The Twig environment needs to be set.</error>');
+
+            return 1;
+        }
+
         $types = array('functions', 'filters', 'tests', 'globals');
 
         if ($input->getOption('format') === 'json') {