fix #13530

[AngelBS]

Description

Fixed Issues (if relevant)

1. "Template file 'header.html' is not found" error while trying to save Design Configuration. #13530: "Template file 'header.html' is not found" error while trying to save Design Configuration.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

All committers have signed the CLA.

[rogyar]

Hello, @AngelBS. Thank you for the contribution.
Your solution fixes the behaviour. However, it does not fix the issue.
The design_email_header_template and design_email_footer_template are declared in the frontend area but on the attempt to save the design configuration the system tries to find the mentioned templates in the adminhtml area. That's the main reason for the issue.
So, the templates area upon the request should be fixed first of all (from adminhtml to frontend). After that, we will not have the necessity to duplicate the existing templates in frontend and adminhtml (it does not make sense).
Thanks.

[rogyar]

@AngelBS are you going to proceed with this PR?

[rogyar]

Closing this request because of no activity