fix for bug #384731: "Bookmark This Page" throws exception on close in bookmarkProperties.js if you have "bookmarkPropertiesDialog/lastUsed" annotations that point to itemIds for folder that don't exist

fix for bug #384733:  "Add Bookmark" dialog truncated if you have "bookmarkPropertiesDialog/lastUsed" annotations that point to itemIds for folder that don't exist

r=mano

browser/components/places/content/bookmarkProperties.js

@@ -371,12 +371,19 @@ var BookmarkPropertiesPanel = {
    * @return the new menu item.
    */
   _appendFolderItemToMenupopup:
-  function BPP__appendFolderItemToMenuList(aMenupopup, aFolderId) {
+  function BPP__appendFolderItemToMenupopup(aMenupopup, aFolderId) {
+    try {
+      var folderTitle = PlacesUtils.bookmarks.getItemTitle(aFolderId);
+    }
+    catch (ex) {
+      NS_ASSERT(folderTitle, "no title found for folderId of " + aFolderId);
+      return null;
+    }
+
     // First make sure the folders-separator is visible
     this._element("foldersSeparator").hidden = false;
 
     var folderMenuItem = document.createElement("menuitem");
-    var folderTitle = PlacesUtils.bookmarks.getItemTitle(aFolderId)
     folderMenuItem.folderId = aFolderId;
     folderMenuItem.setAttribute("label", folderTitle);
     folderMenuItem.className = "menuitem-iconic folder-icon";
@@ -424,6 +431,12 @@ var BookmarkPropertiesPanel = {
 
     var defaultItem =
       this._getFolderMenuItem(this._defaultInsertionPoint.itemId, true);
+
+    // if we fail to get a menuitem for the default insertion point
+    // use the Bookmarks root
+    if (!defaultItem)
+      defaultItem = this._element("bookmarksRootItem");
+
     this._folderMenuList.selectedItem = defaultItem;
   },