[scan] Fix device selection issue fallback scenario

[arc-v2]

Fixes #21768 when there is no device match for a given name.

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I see several green ci/circleci builds in the "All checks have passed" section of my PR (connect CircleCI to GitHub if not)
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.
• I've added or updated relevant unit tests.

Motivation and Context

Resolves 21768

Description

This was a regression from 2.218 which introduces nil when the device string did not return a matching item (Steps described in the issue report). It causes the second lambda to not be used and hence there was an error instead of using a default device.

Previously (v2.217.0) it retuned an empty array in such case. This implementation restores the old behaviour by removing all nil values from the array such as [nil] -> []

I have run it locally by installing this gem from source. The rest of the steps are same as per the issue report.

Testing Steps

[joshdholtz]

Thanks for fixing this! 🫶