Fix NoMethodError when running individual specs

What does this MR do?

This merge request introduces a safeguard against nil values that might be passed to the sanitize_path function within the spec_helper.rb file. Specifically, it modifies the full_description and output_dir functions to ensure that nil is replaced with an empty string before being processed. This change prevents NoMethodError exceptions when either metadata[:full_description] or metadata[:description] are nil.

What are the relevant issue numbers?

Slack (internal link good for 90 days)

Related merge requests

Fix long file path bug by storing output in sub... (!56 - merged) • Adam Cohen • 16.11