[FIX] product_ur referenced before assignment in refund

wizard/scop_bordereau_refund_wizard.py

@@ -81,6 +81,7 @@ class ScopBordereauRefundWizard(models.TransientModel):
         ur_hdf = self.env.ref("cgscop_partner.riga_14232").id
         ur_idf = self.env.ref("cgscop_partner.riga_14231").id
         ur_med = self.env.ref("cgscop_partner.riga_14243").id
+        product_ur = False
         if bordereau_id.partner_id.ur_id.id == ur_hdf:
             product_ur = self.env.company.contribution_hdf_id
         elif bordereau_id.partner_id.ur_id.id == ur_idf: