fix(internal/gapicgen): skip empty file paths in gatherChanges

[quartzmo]

refs: #13188
refs: #13189

[gemini-code-assist]

Summary of Changes

Hello @quartzmo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a fix to the internal gapicgen tool, specifically within the generator.go file. The changes enhance the robustness of the gatherChanges function by improving error reporting through error wrapping and by preventing the processing of empty file paths. This ensures more reliable operation of the code generation process.

Highlights

• Error Handling Improvement: The error returned when gatherChanges fails now wraps the original error, providing more context and allowing for better error inspection.
• Empty File Path Handling: A new check has been added within the gatherChanges function to explicitly skip any empty file paths encountered during processing, preventing potential issues.

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[gemini-code-assist]

Code Review

The pull request addresses an issue where empty file paths were not being skipped in the gatherChanges function, leading to potential errors. The changes include a check for empty file paths in the loop that iterates through the files. Additionally, the error message in the Generate function has been enhanced to include the underlying error, providing more context for debugging.