Added original exception as the cause to the new exception on product delete error

[woutersamaey]

Description (*)

When Magento can't delete a product a new exception is thrown, but the original exception is not passed to the new exception as the original "cause"

Fixed Issues (if relevant)

Just better error handling

Manual testing scenarios (*)

Just better error handling

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 @woutersamaey. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me 2.3-develop instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Assistant documentation

[federivo]

Changes approved.

[magento-engcom-team]

Hi @federivo, thank you for the review.
ENGCOM-4021 has been created to process this Pull Request

[federivo]

Hi @woutersamaey! Thanks for your contribution.

When merged, consider back-porting this to 2.2. You can easily achieve it using the Porting Tool, check here.

[ghost]

Hi @woutersamaey, thank you for your contribution!
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