Fix warning

Port tests to v12 and python3

account_bank_statement_import_save_file/models/account_bank_statement.py

@@ -9,7 +9,9 @@ class AccountBankStatement(models.Model):
 
     import_file = fields.Many2one(
         'ir.attachment', 'Import file', readonly=True)
-    import_date = fields.Datetime(related='import_file.create_date')
-    import_user = fields.Many2one(related='import_file.create_uid')
+    import_date = fields.Datetime(
+        related='import_file.create_date', string='Imported on')
+    import_user = fields.Many2one(
+        related='import_file.create_uid', string='Imported by')
     import_log = fields.Text(
         related='import_file.description', string='Import Warnings')

account_bank_statement_import_save_file/models/account_bank_statement_import.py

@@ -24,11 +24,12 @@ class AccountBankStatementImport(models.TransientModel):
     @api.model
     def _prepare_import_file_attachment(self, data_file, statement_id,
                                         notifications, filename):
+        if not filename:
+            filename = '<unknown>'
         return {
             'name': filename,
             'res_model': 'account.bank.statement',
             'res_id': statement_id,
-            'type': 'binary',
             'datas': data_file,
             'datas_fname': filename,
             'description': '\n'.join(