PHP 8.1: "is_file(): Passing null to parameter #1 ($filename) of type string is deprecated"

[HYR]

Description

I have 3 snippet calls for prepending or appending code as needed. None of these snippets exist until I need them. Until now this method has worked well. When upgrading to PHP 8.1 I get the following error:

With PHP 8.1 the deprecation shown in the screenshot above is not handled by Kirby as of version 3.6.1.1.

Expected behavior
I expect Kirby to ignore snippets that don't exist, without producing an error.

To reproduce

1. Be sure to have PHP 8.1 installed
2. In PHP call a snippet that doesn't exist.
3. You should see the Error

Your setup

Kirby Version
Kirby 3.6.1.1

[afbora]

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