--- a/Helpviewer/HelpWindow.py	Wed Aug 11 20:16:03 2010 +0200
+++ b/Helpviewer/HelpWindow.py	Thu Aug 12 10:10:21 2010 +0200
@@ -1507,7 +1507,7 @@
         @param url URL of the new site (QUrl)
         """
         selectedURL = url.toString()
-        if selectedURL and self.pathCombo:
+        if selectedURL != "" and self.pathCombo is not None:
             i = self.pathCombo.findText(selectedURL)
             if i == -1:
                 if not QWebSettings.globalSettings()\