Merge pull request CreateJS#1042 from owendwyer/patch-1

Prevent error on Touch.disable(stage)

Author: danzen

src/easeljs/ui/Touch.js

@@ -110,7 +110,7 @@ this.createjs = this.createjs||{};
 	 * @static
 	 **/
 	Touch.disable = function(stage) {
-		if (!stage) { return; }
+		if (!stage||!stage.__touch) { return; }
 		if ('ontouchstart' in window) { Touch._IOS_disable(stage); }
 		else if (window.PointerEvent || window.MSPointerEvent) { Touch._IE_disable(stage); }