More action-deletetiddler fixes

core/modules/widgets/action-deletetiddler.js

@@ -55,7 +55,7 @@ DeleteTiddlerWidget.prototype.refresh = function(changedTiddlers) {
 Invoke the action associated with this widget
 */
 DeleteTiddlerWidget.prototype.invokeAction = function(triggeringWidget,event) {
-	var tiddlers;
+	var tiddlers = [];
 	if(this.actionFilter) {
 		tiddlers = this.wiki.filterTiddlers(this.actionFilter,this);
 	}

editions/prerelease/tiddlers/ActionDeleteTiddlerWidget.tid

@@ -25,10 +25,18 @@ The ''action-deletetiddler'' widget is invisible. Any content within it is ignor
 
 ! Examples
 
-Here is an example of a button that deletes the tiddler HelloThere. Note:
+Here is an example of a button that deletes the tiddler HelloThere:
 
 <$macrocall $name='wikitext-example-without-html'
 src='<$button>
 <$action-deletetiddler $tiddler="HelloThere"/>
-Delete "HelloThere"
+Delete "~HelloThere"
+</$button>'/>
+
+Here is an example of a button that deletes all tiddlers tagged [[TableOfContents]]:
+
+<$macrocall $name='wikitext-example-without-html'
+src='<$button>
+<$action-deletetiddler $filter="[tag[TableOfContents]]"/>
+Delete tiddlers tagged "~TableOfContents"
 </$button>'/>