[FIX] account_bank_statement_import: use the journal's company currency if...

[FIX] account_bank_statement_import: use the journal's company currency if none is defined in the journal

closes odoo/odoo#121293

Signed-off-by: Quentin De Paoli <qdp@odoo.com>

addons/account_bank_statement_import/account_bank_statement_import.py

@@ -172,7 +172,7 @@ class AccountBankStatementImport(models.TransientModel):
 
         # If importing into an existing journal, its currency must be the same as the bank statement
         if journal:
-            journal_currency = journal.currency_id
+            journal_currency = journal.currency_id or journal.company_id.currency_id
             if currency is None:
                 currency = journal_currency
             if currency and currency != journal_currency: