Ignore styles which no longer apply

[fredden]

Description

When PageBuilder initialises, it moves styles from a <style> tag into data-{viewport}-styles attributes. If there are CSS selectors that do not match any elements, an error is thrown:

This pull request fixes this bug.

Manual testing scenarios

1. Use Magento import tool to set a product description (or other Page Builder-enabled attribute) which contains HTML, including some CSS that does not match any elements. (eg, <span>Sample text</span><style>#not-found { color: red; }</style>)
2. Navigate to this product in the admin.
3. Witness that Page Builder fails to initialise for this field, and saving the product is impossible (due to a different JavaScript error which stems from the same root cause).
4. Apply the changes in this pull request.
5. Witness that Page Builder initialises as expected, and it is possible to save the product.

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)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

Resolved issues:

1. resolves [Issue] Ignore styles which no longer apply #863: Ignore styles which no longer apply

[paras89]

@magento run all tests

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[paras89]

@fredden - can you pull develop branch into your fork's branch and fix a failing static test? After that we should be good to merge this PR!

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[paras89]

@magento run Functional Tests B2B

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[paras89]

@magento run Functional Tests B2B

[magento-automated-testing]

The requested builds are added to the queue. You should be able to see them here within a few minutes. Please re-request them if they don't show in a reasonable amount of time.

[engcom-Hotel]

@magento run all tests

[engcom-Hotel]

@magento create issue