List_ID is not presented in returned for files as documented

[duncan]

(robdimsdale https://disqus.com/by/robdimsdale/ reports)

It appears that list_id is not presented in the returned JSON for the files/file endpoints, as it is described in the above documentation. Other files like task_id and user_id are present.

Example curl as follows:

curl
-H "X-Access-Token: $WL_ACCESS_TOKEN"
-H "X-Client-ID: $WL_CLIENT_ID"
https://a.wunderlist.com/api/v...