Upsert for uniqueness, how to know if the Cond blocked the Mutation?

[MichelDiz]

@mko0815

query {
		user as var(func: eq(email, %s))
	}

The query response will be empty cuz this query is empty. It should be like:

query {
		user as var(func: eq(email, %s)) {
                     UID
                     email
                     name
              }
	}

That way you will have responses in the query response key.