can not create new product category

creating a new product category

openerp-client -l info

WARNING:translate:Kann locale en_US.UTF-8 nicht setzen

Traceback (most recent call last):
  File "/usr/lib64/python2.6/site-packages/openerp-client/modules/gui/main.py", line 1287, in _sig_child_call
    res = wid.handlers[button_name]()
  File "/usr/lib64/python2.6/site-packages/openerp-client/modules/gui/window/form.py", line 285, in sig_new
    self.screen.new()
  File "/usr/lib64/python2.6/site-packages/openerp-client/widget/screen/screen.py", line 394, in new
    model = self.models.model_new(default, self.domain, ctx)
  File "/usr/lib64/python2.6/site-packages/openerp-client/widget/model/group.py", line 239, in model_new
    newmod.default_get(domain, ctx)
  File "/usr/lib64/python2.6/site-packages/openerp-client/widget/model/record.py", line 162, in default_get
    self.set_default(val)
  File "/usr/lib64/python2.6/site-packages/openerp-client/widget/model/record.py", line 207, in set_default
    self.mgroup.mfields[fieldname].set_default(self, value)
  File "/usr/lib64/python2.6/site-packages/openerp-client/widget/model/field.py", line 106, in set_default
    res = self.set(model, value)
  File "/usr/lib64/python2.6/site-packages/openerp-client/widget/model/field.py", line 266, in set
    model.value[self.name] = result[0]
IndexError: list index out of range

in ir_property I found a record with
res_id empty
name=property_account_expense_categ
value=account.account,5
and account 5 does not exist
had to remove this and similar resources

it could well be that this comes from a migration error AND orm modification, because this error didn't occur since migration.

crosscheck
branch-server 1795
branch-addons 2329
it is possible to delete an account which is used in product_category properties and defaults
the pointers are correctly removed, but IMHO a warning should be issued if "used" accounts are removed.

BTW I do not understand bazaar ... how can revision numbers go backwards?
bzr revno
970
> bzr pull
Using saved parent location: http://bazaar.launchpad.net/~openerp/openobject-client/5.0/
 M bin/po/fr.po
 M bin/widget/view/form_gtk/many2one.py
 M bin/widget/view/form_gtk/textbox_tag.py
All changes applied successfully.
Now on revision 950.