Fix FileLayout to work in non Web context, like Cli, Api

[Fedik]

Fix for stuff like #38222 and #38214 .

Summary of Changes

FileLayout is fail to be render in non Web context, because it does not have a template, obviously.
I changed FileLayout class, so it will ignore the template in non Web context if it not provided within the options.

Testing Instructions

Create file layouts/potato.php with content:

<?php
echo 'Layout works!';

Add layout rendering:

$symfonyStyle->success(\Joomla\CMS\Layout\LayoutHelper::render('potato'));

Around here

joomla-cms/libraries/src/Console/CleanCacheCommand.php

Line 73 in dd91072

$symfonyStyle->success('Cache cleaned');

Then from console run php cli/joomla.php cache:clean

Actual result BEFORE applying this Pull Request

an error: getTemplate undefined

Expected result AFTER applying this Pull Request

No error, you should see extra message from potato layout

Documentation Changes Required

Probably. FileLayout support template option, that should be a template name.

[brianteeman]

I have tested this item ✅ successfully on eb5a5bf

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[dgrammatiko]

I have tested this item ✅ successfully on eb5a5bf

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[brianteeman]

I have tested this item 🔴 unsuccessfully on eb5a5bf

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[richard67]

@brianteeman Why the unsuccessful test? What hasn't worked?

[viocassel]

I have tested this item ✅ successfully on eb5a5bf

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[brianteeman]

I have not tested this item.

marking as not tested. Comment to error on this PR #38650 (comment) suggests thatb this PR is not complete

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[Fedik]

@brianteeman that error do not related to FileLayout class which in current PR,
that about PluginHelper::getLayoutPath() that is separated thing, the PR for it is there #39550

[richard67]

I see the remaining issue is covered by another PR #39550 , so this PR here seems to be complete. See comment here: #38650 (comment) .

[richard67]

RTC

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[fancyFranci]

Thank you for your work, Fedik!