fix(secrets): fix empty diff scan

[omryMen]

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Below is a concise technical summary of the changes proposed in this PR:

Fix the GitHistoryScanner class to handle empty file diffs by adding a check to skip processing when file_diff is empty, ensuring smoother execution of the secrets scanning process.

Topic	Details
Empty Diff Handling	Handle empty file diffs in the GitHistoryScanner class to prevent unnecessary processing. Modified files (1) checkov/secrets/scan_git_history.py Latest Contributors(2) Email Commit Date Saarett@users.noreply.... feat-general-Update-th... April 03, 2024 anton.gruebel@gmail.com chore-add-import-linte... August 06, 2023

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