Prevent running SQL query on every item in the database when the quote is empty

[LordZardeck]

Description

During custom development on Magento, we needed the ability to have a quote be created and loaded into the session with no items. We started noticing performance issues throughout ajax banner loads and checkout cart loads after this change. After further inspection, we noticed that a call to \Magento\Quote\Model\ResourceModel\Quote\Item\Collection::removeItemsWithAbsentProducts resulted in a query on the catalog_product_entity table that performed a table scan across all 1.3 million products in the database, simply because no filter was being applied. The requested change simply is a check if there are any product ids to filter before attempting to filter. While this may not affect any stand-alone magento installations, it has no negative effect and if any other developer seeks to implement the capability of loading empty quotes into the session, this will alleviate potential performance issues.

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

Hi @LordZardeck. Thank you for your contribution.
We will aim to release these changes as part of 2.2.6.
Please check the release notes for final confirmation.

Please, consider to port this solution to 2.3 release line.
You may use Porting tool to port commits automatically.