whatsapp_web_groups/custom_import_layout/models/account_move.py

from odoo import api, fields, models

class AccountMoveLine(models.Model):
    _inherit = "account.move.line"

    @api.model_create_multi
    def create(self, vals_list):
        res = super().create(vals_list)
        for line in res:
            if not line.product_id:
                line.tax_ids = False
        return res