[6.0][account_accountant] not installing without demo data

Hello,

I got the following error when i'm trying to install account_accountant without the demo data :

[2010-11-10 13:40:27,835][accountant] ERROR:db.cursor:bad query: insert into "res_users" (id,"menu_id","address_id","context_lang","company_id","menu_tips","active","password",create_uid,create_date) values (6,1,NULL,E'en_US',1,E'True',E'True',E'',1,now())
Traceback (most recent call last):
  File "/oerp/server/bin/sql_db.py", line 122, in execute
    res = self._obj.execute(query, params)
IntegrityError: ERREUR: une valeur NULL viole la contrainte NOT NULL de la colonne « name »

[2010-11-10 13:40:27,835][accountant] ERROR:tools.convert.xml_import:Parse error in /oerp/addons/account_accountant/security/account_security.xml:9:
<record id="base.user_demo" model="res.users">
            <field name="groups_id" eval="[(4, ref('account.group_account_user'))]"/>
        </record>
MODEL 68 75 name

I think it's because in /account_accountant/security/account_security.xml you're refering to base.user_demo who doesn't exist if the demo data are not installed.

Thanks