[FIX] l10n_fr_pos_cert: raise error when there is no order

Before this commit: if the user wanted to generate a
POS Inalterability Check statement, an IndexError was raised.
This commit raises a more understandable error.

opw-3237383

closes odoo/odoo#117398

X-original-commit: 9cc56fc3d3cdb43e393df0975e10192c3b10f455
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>
Signed-off-by: Pedram Bi Ria (pebr) <pebr@odoo.com>

addons/l10n_fr_pos_cert/models/res_company.py

@@ -65,6 +65,7 @@ class ResCompany(models.Model):
 
             if not orders:
                 msg_alert = (_('There isn\'t any order flagged for data inalterability yet for the company %s. This mechanism only runs for point of sale orders generated after the installation of the module France - Certification CGI 286 I-3 bis. - POS', self.env.company.name))
+                raise UserError(msg_alert)
 
             previous_hash = u''
             corrupted_orders = []