Fix error reading exe process information

[dhurley]

Proposed changes

Update Processes function to only add the exe path for nginx master processes and to leave it empty for nginx worker processes

Checklist

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• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)