revert r30891 for now, it has side effects (in erp5_subversion commit dialog for example)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30893 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/Form.py

@@ -130,6 +130,13 @@ class StaticValue:
       value = value.__of__(field)
       #value=value() # Mising call ??? XXX Make sure compatible with listbox methods
 
+    if id == 'default':
+      # We make sure we convert values to empty strings
+      # for most fields (so that we do not get a 'value'
+      # message on screen)
+      # This can be overriden by using TALES in the field
+      if value is None: value = ''
+
     return value
 
 class TALESValue(StaticValue):