Getting null value for "to name" in email template

Issue

Enable the email functionality, after submitting the form, getting the ''null'' value in the 'to' section of the email template.
Steps to reproduce:

1. Start Liferay DXP 7.4
2. Navigate to Control Panel > Notifications > Templates. Click on the add button to create a new template and fill in the necessary information.
3. Now, navigate to Control Panel >Objects. Create a new object, then create a new field inside the created objects.
4. Inside the created object, select the 'Action' tab, create a new action, and name the label, under 'Action Builder' apply the rule and click on 'Save'.
5. Navigate to Site Menu > Fragment and create a new fragment set and add the fragment, then select the 'Form Fragment' , choose the available option, click on 'add', and publish the form.
6. Create a page, drag and drop the 'form container', and map the form by selecting the object that we have created in the 2nd step.
7. To configure the mail on the portal please see this article: How-to-set-up-a-Mail-Server-with-DXP-to-receive-email-notifications-
Observer behavior: Getting the "null' value in place of 'to name' in the email notification
Expected behavior: Should get the 'to name' in the email template instead of 'null'

If a hotfix is required, please create a support ticket requesting the hotfix by attaching the patch details.
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