Propagation: only warn about oversized baggage headers when headers exist #2212
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Description
Warnings were being logged about the baggage header being too long when the header was not present. This PR just adds a check to make sure the warning is only emitted when the header exists.
The main issue is that this was creating a lot of noise in logs, because the project where opentelemetry is used is the first one to receive requests (and thus will never have the baggage header set).
Type of change
How Has This Been Tested?
Tox has been run. I'm not sure much else is necessary, given that no behavior has been changed, only logging.
Does This PR Require a Contrib Repo Change?
Checklist: