It seems that BadRequest exceptions, like the ones thrown by checkValidId() in OFS.ObjectManager (lib/python/OFS/ObjectManager.py), are not handled by a standard_error_message. That is, I can't skin the error message so it looks friendly and doesn't show a traceback. Does anyone know where the code that generates the error message for these exceptions is kept? Is there a way to make these exceptions get handled via standard_error_message?