R1:2875f029be7f

Fix an issue with custom policy edit control not populating correctly

Summary: These values aren't always provided. They should be, but just make things work for now.

Test Plan:
- Edited a task.
- Selected "Custom Policy" for "Edit Policy".
- Configured a policy like "Users: dog".
- Saved policy.
- Selected "Custom Policy" again to edit the policy.
- Before patch: tokenizer fails to render with an error (`config.types` is not an object).
- After patch: tokenizer renders properly, albeit…