\Magento\Config\Model\Config\Source\Email\Template::toOptionArray throws error when setPath() is not called first

[willwright]

Preconditions (*)

1. dev-2.4-develop

Steps to reproduce (*)

1. Create a custom module, plugin, or Observer
2. Inject a concrete instance of \Magento\Framework\ObjectManagerInterface ($this->_objectManager) through the constructor
3. Execute the following:

$sourceModelObj = $this->_objectManager->create('\Magento\Config\Model\Config\Source\Email\Template');
$optionsArray = $sourceModelObj->toOptionArray();

4. Notice unhandled exception is written to the screen

Expected result (*)

1. Should not throw an error
2. Should return default collection options

Actual result (*)

Exception #0 (UnexpectedValueException): Email template '' is not defined.
<pre>#1 Magento\Email\Model\Template\Config->getTemplateLabel('') called at [vendor/magento/module-config/Model/Config/Source/Email/Template.php:64]
#2 Magento\Config\Model\Config\Source\Email\Template->toOptionArray() called at [app/code/Magesmith/ScopeExplorer/Block/Scopes.php:172]
#3 Magesmith\ScopeExplorer\Block\Scopes->getSourceModelValue('catalog_producta...') called at [app/code/Magesmith/ScopeExplorer/Block/Scopes.php:135]
#4 Magesmith\ScopeExplorer\Block\Scopes->getWebsiteScopeValue(&Magento\Store\Model\Website\Interceptor#00000000476d138d000000000886eb4d#) called at [app/code/Magesmith/ScopeExplorer/Block/Scopes.php:97]
#5 Magesmith\ScopeExplorer\Block\Scopes->hasScopeValue() called at [app/code/Magesmith/ScopeExplorer/view/adminhtml/templates/scopes.phtml:7]
#6 include('/mnt/f/www/local...') called at [vendor/magento/framework/View/TemplateEngine/Php.php:59]
#7 Magento\Framework\View\TemplateEngine\Php->render(&Magesmith\ScopeExplorer\Block\Scopes#00000000476d1f2e000000000886eb4d#, '/mnt/f/www/local...', array('csp' => &Magento\Csp\Helper\InlineUtil#00000000476d1d31000000000886eb4d#)) called at [vendor/magento/framework/Interception/Interceptor.php:58]

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• [x ] Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @willwright. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

For more details, please, review the Magento Contributor Assistant documentation.

Please, add a comment to assign the issue: @magento I am working on this

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