[ckan-dev] package_update throws error when adding extra field

[Sean Hammond]

> Furthermore there is a new error. It is not possible anymore, to
> create a new dataset. When starting the third step an error message is
> raised:
> 
> [ckan.lib.plugins] incorrect form fields posted, missing
> set(['updated'])

This issue should be fixed on master now, and the plan is to backport
the fix into release-v2.0 as well. (The check_data_dict() method that
causes this problem has been removed.)