Add Logging and Error Handling for get_benchmark_final_target_code

[Ekam219]

Add Logging and Error Handling for get_benchmark_final_target_code

Description

@DonggeLiu
While PR #905 addresses JSON syntax issues in crash.json, the root cause of missing source_code fields—such as silent failures in get_benchmark_final_target_code()—remains unresolved. This issue focuses on adding logging and improving error handling to diagnose and mitigate such failures effectively.

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Scope of Work

📝 Enhanced Logging

• Add logs to identify when source_code is missing and the reason behind it.
• Log invalid sample_id formats (e.g., cases where sample_id cannot be split into benchmark/sample).
• Capture errors related to missing source code files.

⚡ Improved Error Handling

• Ensure get_benchmark_final_target_code() handles malformed or empty sample_id gracefully.
• Return null explicitly instead of empty strings in JSON outputs to improve clarity.
• Implement fallback mechanisms for missing or malformed data.

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Why This Matters

✅ Improved Debuggability – Logs will help identify whether source_code is missing due to experiment failures or internal code issues.
✅ Increased Robustness – Ensures graceful handling of errors instead of silent failures, reducing invalid JSON outputs.

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