fix(PC): 修复后台关闭签到时前端页面报错的问题

issue zhiyicx/plus-component-pc#1118

Author: mutoe

packages/zhiyicx-plus-pc/resources/views/widgets/checkin.blade.php

@@ -1,7 +1,8 @@
 @php
     use function Zhiyi\Component\ZhiyiPlus\PlusComponentPc\getAvatar;
 @endphp
-@if (isset($config['bootstrappers']['checkin']) && !empty($data) )
+
+@if (($config['bootstrappers']['checkin'] ?? false) && !empty($data) )
 <div class="checkin_cont">
     <div class="checkin_user">
         <span>
@@ -25,4 +26,4 @@
     </div>
     @endif
 </div>
-@endif
+@endif