Don't assume `product._md` exists #991

Job	Run time
test-without-botocore	1m 0s
build-binder-env	11s
build-wheels	18s
build-test-env-base	17s
build-notebooks	4s
run-black-check	24s
run-mypy	13s
run-pylint	45s
check-docs	33s
test-wheels	27s
test-with-botocore-and-coverage	25s
	4m 37s

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