FindAndModify no longer returns "value" if upsert results in an insert and "new" is false

To reproduce, run a 3.0.0-rc8 server: > db.test.remove({}) > db.runCommand({findAndModify: "test", query: {_id: "miss"}, update: {$set: {y:2}}, upsert: true}) { "value" : null, "lastErrorObject" : { "updatedExisting" : false, "n" : 1, "upserted" : "miss" }, "ok" : 1 } Here is the result with a 3.0.0-rc9 (and 3.0.0-rc10) server: > db.test.remove({}) > result = db.runCommand({findAndModify: "test", query: {_id: "miss"}, update: {$set: {y:2}}, upsert: true}) { "lastErrorObject" : { "updatedExisting" : false, "n" : 1, "upserted" : "miss" }, "ok" : 1 }