Bug: decrypt function fails if the ciphertext is just plaintext

[calvinbrewer]

Issue Description

When encryptedPayload.c is missing (i.e., not in the EQL payload data structure), the decrypt function currently panics. We want to handle this more gracefully by simply returning the original value and issuing a debug-level log message indicating that no ciphertext was found and the function will skip decryption. This ensures the function doesn’t break application flow due to absent ciphertext while still providing visibility through logging.

Proposed Change

• Check if encryptedPayload.c is present.
• If missing, return the original (unencrypted) value.
• Log a debug message stating that the payload did not include a ciphertext, and decryption was skipped.
• Maintain existing decryption steps if encryptedPayload.c is present.