Fixed broken `null` check for attachment thumbnail links #8913

	name: Templates

	on:
	push:
	branches:
	- "5.2"
	- "5.3"
	- "5.4"
	- "5.5"
	- "6.0"
	- master
	pull_request:

	permissions:
	contents: read

	jobs:
	sync:
	name: Check for differing synced templates.
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- run: sudo apt-get install -y jq diffutils
	- name: Check for differences
	run: \|
	for template in $(jq -r '.templates[] + ".tpl"' < syncTemplates.json); do
	defaultDirectory="$(jq -r '.directories[0]' < syncTemplates.json)"
	for directory in $(jq -r '.directories[]' < syncTemplates.json); do
	diff -u $defaultDirectory/$template $directory/$template
	done
	done

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