Don't break when add citation box is closed directly instead of cancelled

chrome/content/zotero/integration/addCitationDialog.js

@@ -34,6 +34,7 @@ var Zotero_Citation_Dialog = new function () {
 		"suppress-author":["checked", false]
 	};
 	
+	var _accepted = false;
 	var _itemData = new Object();
 	var _multipleSourcesOn = false;
 	var _lastSelected = null;
@@ -581,6 +582,8 @@ var Zotero_Citation_Dialog = new function () {
 	 * called when accept button is clicked
 	 */
 	function accept() {
+		if(_accepted) return true;
+
 		_getCitation();
 		var isCustom = _previewShown && io.citation.citationItems.length	// if a citation is selected
 				&& _originalHTML
@@ -600,6 +603,7 @@ var Zotero_Citation_Dialog = new function () {
 		}
 		
 		io.accept();
+		_accepted = true;
 		return true;
 	}
 	
@@ -607,8 +611,12 @@ var Zotero_Citation_Dialog = new function () {
 	 * called when cancel button is clicked
 	 */
 	function cancel() {
+		if(_accepted) return true;
 		io.citation.citationItems = new Array();
+
 		io.accept();
+		_accepted = true;
+		return true;
 	}
 	
 	/*

chrome/content/zotero/integration/addCitationDialog.xul

@@ -41,7 +41,7 @@
 	onunload="doUnload();"
 	ondialogaccept="return Zotero_Citation_Dialog.accept();"
 	ondialogcancel="Zotero_Citation_Dialog.cancel();"
-	onclose="Zotero_Citation_Dialog.cancel(); event.preventDefault(); event.stopPropagation();"
+	onclose="Zotero_Citation_Dialog.cancel();"
 	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
 	persist="screenX screenY width height"
 	resizable="true"

chrome/content/zotero/integration/editBibliographyDialog.js

@@ -235,15 +235,18 @@ var Zotero_Bibliography_Dialog = new function () {
 	 * Called when OK button is pressed
 	 */
 	this.accept = function() {
-		_accepted = true;
+		if(_accepted) return;
 		_updatePreview(true);
+		_accepted = true;
 	}
 	
 	/**
 	 * Called when Cancel button is pressed
 	 */
 	this.close = function() {
-		if(!_accepted) bibEditInterface.cancel();
+		if(_accepted) return;
+		bibEditInterface.cancel();
+		_accepted = true;
 	}
 	
 	/**

chrome/content/zotero/integration/editBibliographyDialog.xul

@@ -38,7 +38,7 @@
 	onload="Zotero_Bibliography_Dialog.load();"
 	ondialogaccept="Zotero_Bibliography_Dialog.accept();"
 	ondialogcancel="Zotero_Bibliography_Dialog.close();"
-	onclose="Zotero_Bibliography_Dialog.close(); event.preventDefault(); event.stopPropagation();"
+	onclose="Zotero_Bibliography_Dialog.close();"
 	onunload="doUnload();"
 	buttons="extra1,extra2,accept,cancel" buttonpack="end"
 	xmlns:html="http://www.w3.org/1999/xhtml"