Use contextlib's suppress method to silence an error

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced error handling in YOLOv5 model configuration parsing.

📊 Key Changes

• Imported contextlib module.
• Simplified the handling of NameErrors during model configuration parsing using contextlib.suppress instead of a try-except block.

🎯 Purpose & Impact

• The purpose of this change is to streamline the code and make the error handling more readable and Pythonic.
• The impact on users is likely minimal, as this is an internal code quality improvement. It could reduce the potential for future bugs and make the codebase easier to maintain. 🛠️