当try块出现错误时，如何显示默认的laravel错误页面？

<?php

namespace App\Exceptions;

use Exception;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;

class Handler extends ExceptionHandler
{
    // ...

    public function render($request, Exception $exception)
    {
        if ($exception instanceof \Exception) {
            // 处理异常并返回默认的错误页面
            return parent::render($request, $exception);
        }

        return parent::render($request, $exception);
    }

    // ...
}