diff -r bd8480824e0b -r 91a56a30141e web/formwidgets.py
--- a/web/formwidgets.py	Wed Jan 27 09:57:53 2010 +0100
+++ b/web/formwidgets.py	Wed Jan 27 09:59:13 2010 +0100
@@ -115,7 +115,7 @@
         posted = form._cw.form
         val = posted.get(field.input_name(form, self.suffix))
         if isinstance(val, basestring):
-            val = val.strip() or None
+            val = val.strip()
         return val
 
     @deprecated('[3.6] use values_and_attributes')