[TwigBundle] fixed typo

Author: fabpot

src/Symfony/Bundle/TwigBundle/TwigEngine.php

@@ -68,7 +68,7 @@ public function exists($name)
  {
  try {
  $this->load($name);
- } catch (\Twig_Error_Loader $e) {
+ } catch (\InvalidArgumentException $e) {
  return false;
  }
 
@@ -133,6 +133,5 @@ protected function load($name)
  } catch (\Twig_Error_Loader $e) {
  throw new \InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
  }
- 
  }
 }