PHP 5.5 requires even null properties to be defined

Author: eli-darkly

tests/FeatureFlagTest.php

@@ -639,6 +639,7 @@ public function testRolloutSelectsBucket()
             'version' => 1,
             'deleted' => false,
             'on' => true,
+            'offVariation' => null,
             'targets' => array(),
             'prerequisites' => array(),
             'rules' => array(),
@@ -671,6 +672,7 @@ public function testRolloutSelectsLastBucketIfBucketValueEqualsTotalWeight()
             'version' => 1,
             'deleted' => false,
             'on' => true,
+            'offVariation' => null,
             'targets' => array(),
             'prerequisites' => array(),
             'rules' => array(),