token_creation_email_filter: "<%= cc_props.uaa.token_creation_email_filter %>" resolves to "[""]"

Using cf-release master/HEAD we're missing field `cc_props.uaa.token_creation_email_filter`

In the generated manifest.yml, we are creating:

``` yaml
    uaa:
      enabled: true
      resource_id: cloud_controller
      token_creation_email_filter:
      - ''
```

Caused by https://github.com/cloudfoundry/cf-release/commit/0ee42dd9