Document.js do not verify the value of this[table.fieldname] before use it in applyFormula method.

[Franklin0702]

THIS HAS AFFECTED IN FRAPPE BOOKS

Problem:

When you submit or revert an invoice with some item with 0% tax, the invoice doesn't update the status.

Steps to reproduce:

1. Create a tax with 0%.

2. Create an Invoice, add an item and select this tax.

3. Save the Invoice and submit it, then you will get the following error in the console:

What I have done:

The error is occurs because in applyFormula method inside document.js, there's not a validation to prevent null values, look at the image below:

To fix this I added the next lines:

Greetings,