title: symfony2 cache clear --env=prod not printing anything
body: <p>When I run, as I usually do <code>php app/console cache:clear --env=prod --no-debug</code>, nothing happens, no message is printed, no error.</p>
  
  <p>Things work fine for <code>--env=dev</code>.</p>
  
  <p>Same goes for <code>assetic:dump</code>.</p>
  
  <p>I'm a bit lost concerning how to troubleshoot this. Does anyone know?</p>