Avoid undefined index warning when using uppercase reserved word

[FreekVandeursen]

ReservedWordsSniff will trigger an undefined index error if a reserved word is used in uppercase.

Manual testing scenarios

1. Create a class containing a reserved word, with at least 1 uppercase character (e.g. Bool)
2. execute phpcs codesniffer with dev/tests/static/framework/Magento/ruleset.xml ruleset

Expected result

Code sniffer error "Cannot use "Bool" in namespace as it is reserved since PHP 7"

Actual result

Code sniffer error "An error occurred during processing; checking has been aborted. The error message was: Undefined index: Bool"

[magento-engcom-team]

Hi @FreekVandeursen. 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 {$VERSION} instance - deploy vanilla Magento instance

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

[orlangur]

Just checked the full method code, looks pretty strange to me, like it was never used in action. Thanks for the fix!

[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-2327 has been created to process this Pull Request

[magento-engcom-team]

Hi @FreekVandeursen. 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.