PHP Error when trying to open mail with empty message body (example PDF attachment from a Canon scanner)

Piler Version: 1.4.1 build 1001 on Ubuntu Linux 22.04.3 with nginx and php8.1

Fresh install.

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2023/09/04 09:22:13 [error] 937~~#937~~: *833 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /var/piler/www/model/search/message.php:183
Stack trace:
#0 /var/piler/www/controller/message/view.php(83): ModelSearchMessage->extract_message()
#1 /var/piler/www/system/front.php(36): ControllerMessageView->index()
#2 /var/piler/www/system/front.php(14): Front->execute()
#3 /var/piler/www/index.php(114): Front->dispatch()
#4 {main}
thrown in /var/piler/www/model/search/message.php on line 183" while reading response header from upstream, client: 192.168.100.61, server: piler.baufeld.local, request: "POST /message.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "piler.baufeld.local", referrer: "http://xxx.yyy.zzz/search.php"

Possible fix in /var/piler/www/model/search/message.php line 183:

      /* null check $parts */
      if(!is_null($parts)) {
          for($i=0; $i<count($parts); $i++) {

             $body = Piler_Mime_Decode::fixMimeBodyPart($parts[$i]['headers'], $parts[$i]['body']);

             if($parts[$i]['headers']['content-type']['type'] == 'text/html') {
                $this->message['text/html'] .= $purifier->purify($body);
             }
             else {
                $this->message['text/plain'] .= $body;
             }

          }
      }

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