(bug) unable to export accounting if label not defined

CHANGELOG.md

@@ -4,6 +4,7 @@
 - Improved SSO testing
 - Fix a bug: unable to run task fix_invoice_item when some invoice items are associated with errors
 - Fix a bug: invalid event date reported when the timezone in before UTC
+- Fix a bug: unable to run accounting export if a line label was not defined
 - [TODO DEPLOY] `rails fablab:fix:invoice_items_in_error` THEN `rails fablab:fix_invoice_items` THEN `rails db:migrate`
 
 ## v5.6.5 2023 January 9

app/services/accounting/accounting_export_service.rb

@@ -62,9 +62,9 @@ class Accounting::AccountingExportService
       when 'date'
         row << line.date&.strftime(date_format)
       when 'account_code'
-        row << line.account_code
+        row << line.account_code.to_s
       when 'account_label'
-        row << line.account_label
+        row << line.account_label.to_s
       when 'piece'
         row << line.invoice.reference
       when 'line_label'