Insert Variable popup missing template variables for new templates

[roma84]

After the following PR #22469 was merged into 2.3-develop, you cannot anymore insert template variables in the newly created email templates.

Preconditions (*)

1. Magento 2.3-develop

Steps to reproduce (*)

1. Go to Marketing > Email Templates and press Add New Template button.
2. Select some template (e.g. Contact Form) and press Load Template button.
3. Press Insert Variable button.

Expected result (*)

1. You should be able to insert template variables:
   

Actual result (*)

1. Template variables section missing:
   

[m2-assistant]

Hi @roma84. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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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:

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@roma84 do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

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[m2-assistant]

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[m2-assistant]

Hi @shikhamis11. Thank you for working on this issue.
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