diff -r 55a94beb521d -r b00f31b3b045 web/formwidgets.py
--- a/web/formwidgets.py	Wed Nov 03 16:39:49 2010 +0100
+++ b/web/formwidgets.py	Fri Nov 05 17:11:40 2010 +0100
@@ -888,7 +888,9 @@
         values = {}
         path = req.form.get(field.input_name(form, 'path'))
         if isinstance(path, basestring):
-            path = path.strip() or None
+            path = path.strip()
+        if path is None:
+            path = u''
         fqs = req.form.get(field.input_name(form, 'fqs'))
         if isinstance(fqs, basestring):
             fqs = fqs.strip() or None