passing id='' or id=None is nonsense

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@40942 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ERP5Type.py

@@ -336,6 +336,9 @@ class ERP5TypeInformation(XMLObject,
       Call the init_script for the portal_type.
       Returns the object.
       """
+      if id is None or len(id) == 0:
+        raise ValueError("invalid object id")
+
       if not temp_object and not self.isConstructionAllowed(container):
         raise AccessControl_Unauthorized('Cannot create %s' % self.getId())