Issue Summary

For select fields (single choice) added to a request type request form (not forms), even if not required, the user doesn't have an option to clear the field after selecting a value.

Steps to Reproduce

1. Create a select field (single choice) with a few options.
2. Add it to a request type request form. 
3. Go the portal and select a value for the field while raising a ticket.
4. Try to clear the value.

Expected Results

We should see an option to clear the value as we had before: https://jira.atlassian.com/browse/JSDCLOUD-13979

Or we should have a "None" option.

Actual Results

There's no way to clear the field.

Workaround

Currently, there's no workaround for this field type. You can use a radio button, which shows the "None" option.