[FIX] account_peppol: handle participant not ready error

If the participant is not active on the IAP server, the server sends back
a Participant not ready error in response without raising an error.
On the client side a user sees a traceback, because we're trying to retrieve
a message uuid of a non-existent peppol message: `response['messages'][i]['message_uuid'].
That's because we treat that error in the try block and then proceed
to the else block because technically there was no exception.

This commit moves that error handling to `else` block so that such invoices get the proper error messages.

Part-of: odoo/odoo#158546

addons/account_peppol/wizard/account_move_send.py

@@ -167,25 +167,26 @@ class AccountMoveSend(models.TransientModel):
                 f"{edi_user._get_server_url()}/api/peppol/1/send_document",
                 params=params,
             )
-            if response.get('error'):
-                # at the moment the only error that can happen here is ParticipantNotReady error
-                for invoice, invoice_data in invoices_data_peppol.items():
-                    invoice.peppol_move_state = 'error'
-                    invoice_data['error'] = response['error']['message']
         except AccountEdiProxyError as e:
             for invoice, invoice_data in invoices_data_peppol.items():
                 invoice.peppol_move_state = 'error'
                 invoice_data['error'] = e.message
         else:
-            # the response only contains message uuids,
-            # so we have to rely on the order to connect peppol messages to account.move
-            invoices = self.env['account.move']
-            for i, (invoice, invoice_data) in enumerate(invoices_data_peppol.items()):
-                invoice.peppol_message_uuid = response['messages'][i]['message_uuid']
-                invoice.peppol_move_state = 'processing'
-                invoices |= invoice
-            log_message = _('The document has been sent to the Peppol Access Point for processing')
-            invoices._message_log_batch(bodies=dict((invoice.id, log_message) for invoice in invoices_data_peppol))
+            if response.get('error'):
+                # at the moment the only error that can happen here is ParticipantNotReady error
+                for invoice, invoice_data in invoices_data_peppol.items():
+                    invoice.peppol_move_state = 'error'
+                    invoice_data['error'] = response['error']['message']
+            else:
+                # the response only contains message uuids,
+                # so we have to rely on the order to connect peppol messages to account.move
+                invoices = self.env['account.move']
+                for message, (invoice, invoice_data) in zip(response['messages'], invoices_data_peppol.items()):
+                    invoice.peppol_message_uuid = message['message_uuid']
+                    invoice.peppol_move_state = 'processing'
+                    invoices |= invoice
+                log_message = _('The document has been sent to the Peppol Access Point for processing')
+                invoices._message_log_batch(bodies=dict((invoice.id, log_message) for invoice in invoices))
 
         if self._can_commit():
             self._cr.commit()