fix: error message in coa importer

[ljain112]

The current validation process only checks for rows with more than 8 columns. This limited check does not account for less than 8 columns, which can cause issues.

Frappe Internal Issue: https://support.frappe.io/app/hd-ticket/19638

Traceback

Traceback (most recent call last):

  File "apps/frappe/frappe/app.py", line 114, in application

    response = frappe.api.handle(request)

               ^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "apps/frappe/frappe/api/__init__.py", line 49, in handle

    data = endpoint(**arguments)

           ^^^^^^^^^^^^^^^^^^^^^

  File "apps/frappe/frappe/api/v1.py", line 36, in handle_rpc_call

    return frappe.handler.handle()

           ^^^^^^^^^^^^^^^^^^^^^^^

  File "apps/frappe/frappe/handler.py", line 49, in handle

    data = execute_cmd(cmd)

           ^^^^^^^^^^^^^^^^

  File "apps/frappe/frappe/handler.py", line 85, in execute_cmd

    return frappe.call(method, **frappe.form_dict)

           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "apps/frappe/frappe/__init__.py", line 1768, in call

    return fn(*args, **newargs)

           ^^^^^^^^^^^^^^^^^^^^

  File "apps/frappe/frappe/utils/typing_validations.py", line 31, in wrapper

    return func(*args, **kwargs)

           ^^^^^^^^^^^^^^^^^^^^^

  File "apps/erpnext/erpnext/accounts/doctype/chart_of_accounts_importer/chart_of_accounts_importer.py", line 175, in get_coa

    forest = build_forest(data)

             ^^^^^^^^^^^^^^^^^^

  File "apps/erpnext/erpnext/accounts/doctype/chart_of_accounts_importer/chart_of_accounts_importer.py", line 239, in build_forest

    (

ValueError: not enough values to unpack (expected 8, got 6)```

Before:

After: