Not importing fields to products makes them empty anyways

[bartrylant]

Description

When using FeedMe to update products in Commerce 5, existing values get overridden, even when you don't import the field.

Example:

In this example, if FeedMe finds an existing product that has a description and has assets, the assets get removed and the description will be overridden by an empty value.

Steps to reproduce

1. Import products with FeedMe
2. Choose to update existing products
3. Select a few field to NOT import
4. The fields that have NOT been selected to update, will be updated anyway (with an empty value)

Additional info

• Craft version: Craft Pro 5.3.6
• PHP version: 8.3.8
• Database driver & version: MySQL 8.3.0
• Plugins & versions: 6.3.0