Don't assume `product._md` exists #1060

Job	Run time
build-test-env-base	10s
build-wheels	15s
build-binder-env	9s
test-without-botocore	54s
build-notebooks	4s
run-pylint	38s
run-black-check	11s
run-mypy	34s
check-docs	31s
test-wheels	26s
test-with-botocore-and-coverage	34s
	4m 26s

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