Do not write a warning log when `LogRecord.body` is None#427

DylanRussell merged 2 commits intoGoogleCloudPlatform:mainGoogleCloudPlatform/opentelemetry-operations-python:mainfrom

DylanRussell:fix_none_logDylanRussell/opentelemetry-operations-python:fix_none_logCopy head branch name to clipboard