Fix require_once deprecation in syntax.php

Fix deprecated syntax for PHP 7.4 compatibility

Doku

Adjust method signatures to match parent

Fix bug when page does not contain a TOC

If this plugin is used in a page without a TOC (e.g., the sidebar), it produces the following error and does not show any content:

PHP Warning: array_mer

Fix bug when page does not contain a TOC

If this plugin is used in a page without a TOC (e.g., the sidebar), it produces the following error and does not show any content:

PHP Warning: array_merge(): Argument #1 is not an array in /var/www/dokuwiki/lib/plugins/condition/syntax.php on line 264

The change fixes this by moving the check to the right place.

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First commit.