in log, allow for one arg only

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@10397 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Base.py

@@ -2196,7 +2196,7 @@ class Base( CopyContainer, PortalContent, ActiveObject, Historical, ERP5Property
     return getattr(self,'title',None)
 
   security.declarePublic('log')
-  def log(self, description, content, level=INFO):
+  def log(self, description, content='', level=INFO):
     """Put a log message """
     if content=='': # allow for content only while keeping interface
         description,content=content,description