[FIX] res_users: change password wizard: fixed crash when submitting the form.

Indeed unlinking wizard content before actually closing it seems to
cause a crash. Instead of unlinking lines with user - password data
we now write a void value on the new password. The stored content
does not contain valuable data after submitting the form.

bzr revid: tde@openerp.com-20140304115017-posdyri9y1cra4jo

openerp/addons/base/res/wizard/change_password_wizard.py

@@ -55,7 +55,7 @@ class change_password_wizard(osv.TransientModel):
             user_ids.append(user.id)
         self.pool.get('change.password.user').change_password_button(cr, uid, user_ids, context=context)
         # don't keep temporary password copies in the database longer than necessary
-        self.pool.get('change.password.user').unlink(cr, uid, user_ids)
+        self.pool.get('change.password.user').write(cr, uid, user_ids, {'new_passwd': False})
         return {
             'type': 'ir.actions.act_window_close',
         }