[Forwardport] Do not overwrite URL Key with blank value

[mage2pratik]

Original Pull Request

#17882

Description

• do not update existing products with a blank URL Key if no url_key value is provided in the import data
• do not update existing products with a new URL Key if a name but no url_key value is provided in the import data

Fixed Issues

• CSV Import of sku,attribute empties url_key value #17023: CSV Import of sku,attribute empties url_key value

Manual testing scenarios

See issue for details. Essentially if importing a CSV with sku,name or sku,description only, the result is the unexpected update or removal of the URL Key of the product.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @mage2pratik. Thank you for your contribution
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[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-3262 has been created to process this Pull Request

[sidolov]

Hi @mage2pratik , please, resolve merge conflicts

[magento-engcom-team]

@mage2pratik thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

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