Fixed possible nulls in Discover Component

CHANGELOG.md

 #### Fixed
 
 * Fixed FocusUIAction that did not update the focus of a button in certain conditions.
+* Fixed possible null in discover components
 
 ## 2019.3.3
 

Runtime/Discover/Discover.cs

     public bool DefaultSelected = false;
     public bool AlignViewToTransform = false;
 
-    public GameObjectToggle[] ObjectsToToggle;
+    public GameObjectToggle[] ObjectsToToggle = new GameObjectToggle[0];
-    public DiscoverSection[] Sections;
+    public DiscoverSection[] Sections = new DiscoverSection[0];
 
 #if UNITY_EDITOR
     [UnityEditor.MenuItem("GameObject/Gameplay Ingredients/Discover", priority=10)]