[Console] Keep the modified exception handler

Author: fancyweb

src/Symfony/Component/Console/Application.php

@@ -171,7 +171,10 @@ public function run(InputInterface $input = null, OutputInterface $output = null
                 }
                 restore_exception_handler();
             } elseif (!$debugHandler) {
-                $phpHandler[0]->setExceptionHandler(null);
+                $finalHandler = $phpHandler[0]->setExceptionHandler(null);
+                if ($finalHandler !== $renderException) {
+                    $phpHandler[0]->setExceptionHandler($finalHandler);
+                }
             }
         }