Don't assume `product._md` exists #1054

Job	Run time
build-binder-env	15s
test-without-botocore	1m 0s
build-wheels	11s
build-test-env-base	10s
run-black-check	11s
run-mypy	38s
run-pylint	43s
build-notebooks	6s
test-wheels	17s
test-with-botocore-and-coverage	36s
check-docs	32s
	4m 39s

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