select() with a nested key results in an empty object when a pointer doesn't exist

[pgiguere1]

Issue Description

When using select() with a nested key on a pointer, e.g. select("pointerKey.nestedKey")
and the fetched object doesn't have a pointer set, getting the pointer will result in and empty object rather than undefined.

I am experiencing this issue on Heroku, but am not able the reproduce it locally, using the same parse-server and node versions.

Steps to reproduce

var query = new Parse.Query("MyClass");
query.doesNotExist("pointerKey");
query.include("pointerKey");
query.first({
  success: function(myObject) {
  	var pointerObject = myObject.get("pointerKey");
  	console.log(pointerObject); // undefined

  	// Expected behavior
  }
});

var query = new Parse.Query("MyClass");
query.doesNotExist("pointerKey");
query.include("pointerKey");
query.select("pointerKey.nestedKey"); // This line causes the issue
query.first({
  success: function(myObject) {
  	var pointerObject = myObject.get("pointerKey");
  	console.log(pointerObject); // [object Object]
  	console.log(JSON.stringify(pointerObject)); // "{}"

  	// pointerObject should be undefined but is an empty Object
  }
});

Expected Results

A pointer that has not been set should return undefined when using get().

Actual Outcome

An empty object is returned when using get().

Environment Setup

• Server

  • parse-server version: 2.5.3
  • Operating System: Ubuntu 14.04
  • Hardware: Heroku hobby dyno
  • Localhost or remote server? Remote, Heroku

• Database

  • MongoDB version: 3.0.11
  • Storage engine: MMAPv1
  • Hardware: Shared cluster (AWS 1GB RAM)
  • Localhost or remote server? Remote, mLab

[promisenxu]

Duplicate of #3999

[flovilmart]

Closing as duplicate, will be fixed with next release.