Text-slicer: Fix issue with missing destination title

plugins/tiddlywiki/text-slicer/modules/startup/slicer-message.js

@@ -1,5 +1,5 @@
 /*\
-title: $:/plugins/tiddlywiki/text-slicer/modules/startup/slicer.js
+title: $:/plugins/tiddlywiki/text-slicer/modules/startup/slicer-message.js
 type: application/javascript
 module-type: startup
 
@@ -22,7 +22,7 @@ exports.synchronous = true;
 exports.startup = function() {
 	$tw.rootWidget.addEventListener("tm-slice-tiddler",function(event) {
 		var slicer = new $tw.Slicer($tw.wiki,event.param,{
-			destTitle: event.paramObject.destTitle
+			destTitle: event.paramObject && event.paramObject.destTitle
 		});
 		slicer.sliceTiddler(event.param)
 		slicer.outputTiddlers();