Although `coupon` is not a single app, when a user tries to install this
module alone, warnings are triggered because no access rules are defined.
Those warnings are pointing the fact that models without access rules
are a bad practice.
closesodoo/odoo#59293
X-original-commit: 801dbd09e217d316d9c048da3a7c4d6597cbc68b
Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>
