making sure window.orientation exists

Author: dmolsen

public/styleguide/js/styleguide.js

@@ -446,16 +446,19 @@
 	});
 
 	// Listen for resize changes
-	var origOrientation = window.orientation;
-	window.addEventListener("orientationchange", function() {
-		if (window.orientation != origOrientation) {
-			$("#sg-gen-container").width($(window).width());
-			$("#sg-viewport").width($(window).width());
-			updateSizeReading($(window).width());
-			origOrientation = window.orientation;
-		}
-	}, false);
-
+	if (window.orientation !== undefined) {
+		var origOrientation = window.orientation;
+		window.addEventListener("orientationchange", function() {
+			if (window.orientation != origOrientation) {
+				$("#sg-gen-container").width($(window).width());
+				$("#sg-viewport").width($(window).width());
+				updateSizeReading($(window).width());
+				origOrientation = window.orientation;
+			}
+		}, false);
+		
+	}
+	
 	// watch the iframe source so that it can be sent back to everyone else.
 	// based on the great MDN docs at https://developer.mozilla.org/en-US/docs/Web/API/window.postMessage
 	function receiveIframeMessage(event) {