removed error message when notification can not be closed

lib/notifications.js

@@ -122,7 +122,12 @@ exports.notify = function({url, errorStack, messageId}, {lists, notificationPref
 		var displayTime = notificationPref.displayTime();
 		if (displayTime){
 			notification.hideTimeout = setTimeout(function(){
+				try {
 					notification.close();
+				}
+				catch(e){
+					// tab is not in focus
+				}
 			}, displayTime * 1000);
 		}
 		

releaseNotes.txt

@@ -9,6 +9,7 @@ Version 0.3.6:
 	fixes:
 		- faking webGL
 		- added readPixels for webGL2
+		- removed error message when notification can not be closed
 
 Version 0.3.5
 	new features: