[FIX] account_qr_code_emv: Improve Fallback error

At the moment, if EMV QR is selected on the invoice where the country does not support EMV QR an error is raised.

However, this error is also raised if EMV QR is selected but the bank account is not set. The following error is raise
`No EMV QR Code is available for the country of the account False.`
This commit adds a check to ensure the bank account is set and raise a better error message.

Task# 3868467

closes odoo/odoo#162500

X-original-commit: e6ca281b691e75dd9c12fb110f80f444c21729de
Signed-off-by: Nicolas Viseur (vin) <vin@odoo.com>

addons/account_qr_code_emv/i18n/account_qr_code_emv.pot

@@ -15,6 +15,13 @@ msgstr ""
 "Content-Transfer-Encoding: \n"
 "Plural-Forms: \n"
 
+#. module: account_qr_code_emv
+#. odoo-python
+#: code:addons/account_qr_code_emv/models/res_bank.py:0
+#, python-format
+msgid "A bank account is required for EMV QR Code generation."
+msgstr ""
+
 #. module: account_qr_code_emv
 #: model:ir.model,name:account_qr_code_emv.model_res_partner_bank
 msgid "Bank Accounts"

addons/account_qr_code_emv/models/res_bank.py

@@ -115,6 +115,8 @@ class ResPartnerBank(models.Model):
     def _get_error_messages_for_qr(self, qr_method, debtor_partner, currency):
         """ Return an error for emv_qr if the account's country does no match any methods found in inheriting modules."""
         if qr_method == 'emv_qr':
+            if not self:
+                return _("A bank account is required for EMV QR Code generation.")
             return _("No EMV QR Code is available for the country of the account %(account_number)s.", account_number=self.acc_number)
 
         return super()._get_error_messages_for_qr(qr_method, debtor_partner, currency)