Summary of Changes

Allow tag <inheritable>0</inheritable> in templateDetails.xml. Use empty() instead of !isset().

Testing Instructions

• Install test template https://github.com/GHSVS-de/GHSVSThings/raw/master/relaterquatch/nonamespacedummynoparent.zip (stolen from @HLeithner).
• The templateDetails.xml looks like this (see <inheritable>0</inheritable>):

<?xml version="1.0" encoding="utf-8"?>
<extension version="4.3" type="template">
	<name>nonamespacedummynoparent</name>
	<creationDate>2022-10-21</creationDate>
	<author>Me</author>
	<authorEmail>joomla@invalid.domain</authorEmail>
	<authorUrl>http://example.com</authorUrl>
	<copyright>Copyright (C) All rights reserved.</copyright>
	<version>1.0</version>
	<description>Test template for namespaces no namespace with no parent</description>
	<inheritable>0</inheritable>
	<files folder="templates/nonamespacedummynoparent">
		<folder>helpers</folder>
		<filename>index.php</filename>
		<filename>templateDetails.xml</filename>
	</files>

	<positions>
		<position>mainmenu</position>
	</positions>
</extension>

• In backend go to templates (not styles).
• Click template link "Nonamespacedummynoparent Details and Files"

Actual result BEFORE applying this Pull Request

A error message:

The template folder is not writable. Some features may not work.

Expected result AFTER applying this Pull Request

No error message

Comment

My build procedure for templates fills tags like inheritable using placeholders like <inheritable>{{inheritable}}</inheritable>. So I think values 0, 1, empty should be accepted without a misleading error message.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed