Mutation Response returns wrong data

[droslean]

Currently, the response of any mutation returns a map of uids and an empty JSON. This is 100% wrong for the following reasons:

• The uids will be returned for some reason when dgraph won't generate the object because of an error that is never returned.
• The Dgraph database returns also the objects that are being generated (based on the schema), but those objects are not included in the response.