ViveController: pose.position/orientation may be null.

examples/js/ViveController.js

@@ -67,8 +67,8 @@ THREE.ViveController = function ( id ) {
 
 			var pose = gamepad.pose;
 
-			scope.position.fromArray( pose.position );
-			scope.quaternion.fromArray( pose.orientation );
+			if ( pose.position !== null ) scope.position.fromArray( pose.position );
+			if ( pose.orientation !== null ) scope.quaternion.fromArray( pose.orientation );
 			scope.matrix.compose( scope.position, scope.quaternion, scope.scale );
 			scope.matrix.multiplyMatrices( scope.standingMatrix, scope.matrix );
 			scope.matrixWorldNeedsUpdate = true;