Update webVRController.ts

Model is disposed (since it is not needed anymore), but on reenter it is not loaded again (since it was disposed, but is not null).

src/Gamepads/Controllers/webVRController.ts

@@ -12,7 +12,7 @@ export abstract class WebVRController extends PoseEnabledController {
     /**
      * Internal, the default controller model for the controller
      */
-    protected _defaultModel: AbstractMesh;
+    protected _defaultModel: Nullable<AbstractMesh>;
 
     // Observables
     /**
@@ -64,7 +64,7 @@ export abstract class WebVRController extends PoseEnabledController {
     /**
      * The default controller model for the controller
      */
-    public get defaultModel(): AbstractMesh {
+    public get defaultModel(): Nullable<AbstractMesh> {
         return this._defaultModel;
     }
 
@@ -154,6 +154,8 @@ export abstract class WebVRController extends PoseEnabledController {
      */
     public dispose(): void {
         super.dispose();
+        
+        this._defaultModel = null;
 
         this.onTriggerStateChangedObservable.clear();
         this.onMainButtonStateChangedObservable.clear();