Revert REST API init objects array (#231)

We didn't anticipated this was causing the REST API response to be changed for all consumers :
- before PR `"objects":null`
- after `"objects":[]`

We don't want that :/

We will instead fix collector-base (object of another PR, see #231)

This reverts commit 7243da3576.
This reverts commit 0940741568.

core/restservices.class.inc.php

@@ -135,15 +135,8 @@ class ObjectResult
  */
 class RestResultWithObjects extends RestResult
 {
-	/** @var DBObject[] */
 	public $objects;
 
-	public function __construct()
-	{
-		parent::__construct();
-		$this->objects = array();
-	}
-
 	/**
 	 * Report the given object
 	 * 	 
@@ -192,7 +185,6 @@ class RestResultWithObjects extends RestResult
 
 class RestResultWithRelations extends RestResultWithObjects
 {
-	/** @var array */
 	public $relations;
 	
 	public function __construct()