Satisfaction Feedback is not added when the Default Outgoing Email Format is set to text

Summary

When the Default Outgoing Email Format is set to text, Satisfaction Feedback is not added in the resolved email notification.

Steps to reproduce

1. Navigate to https://<instance URL>/secure/admin/ViewUserDefaultSettings.jspa
2. Set Default Outgoing Email Format to text
3. Create an issue and have User A as Reporter and User B as Assignee
4. Resolve the issue

Current Result

Satisfaction Feedback is not shown/added in the resolved mail notification

Expected Result

Satisfaction Feedback is added in the resolved email

Workaround

Set Default Outgoing Email Format to html