minor #4677 Add exception to console exception log (adrienbrault)

This PR was submitted for the 2.6 branch but it was merged into the 2.3 branch instead (closes #4677).

Discussion
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Add exception to console exception log

Commits
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2baace0 Add exception to console exception log

cookbook/console/logging.rst

@@ -156,7 +156,7 @@ Then implement the actual listener::
                 $command->getName()
             );
 
-            $this->logger->error($message);
+            $this->logger->error($message, array('exception' => $exception));
         }
     }