Bug 241731 bookmarks sidebar creates empty contextmenu when no items are selected

r=mconnor, a=asa


git-svn-id: svn://10.0.0.236/branches/AVIARY_1_0_20040515_BRANCH@161838 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/browser/components/bookmarks/content/bookmarks.js

@@ -190,6 +190,11 @@ var BookmarksCommand = {
   // selection.
   createContextMenu: function (aEvent, aSelection, aDS)
   {
+    if (aSelection == undefined) {
+      aEvent.preventDefault();
+      return;
+    }
+
     var popup = aEvent.target;
     // clear out the old context menu contents (if any)
     while (popup.hasChildNodes())