Removing branch_exceptions in policy editor doesn't change yaml

Summary

Editing a scan execution security policy that has branch_exceptions doesn't update the policy yaml when exceptions are removed.

Steps to reproduce

1. Create a project.
2. Go to Secure -> Policies.
3. Create a scan execution policy.
4. Define a branch exception. For example:
5. Change the Exceptions field to No exceptions.
6. Observe that the policy yaml is not updated.

What is the expected correct behavior?

Changing the Exceptions field to No exceptions should either remove the branch_exceptions field from the yaml or set it to [].

Relevant logs and/or screenshots

branch_exceptions_remove

Possible workaround

Switch to .yaml mode and remove the branch_exceptions field.