fix: Handle null payloads. (#497) #2571

Job	Run time
contract-tests	2m 42s
contract-tests-curl	2m 54s
build-test-client-windows-curl	15m 13s
build-test	5m 42s
build-test-client-mac	6m 18s
build-test-curl	5m 33s
build-test-client-mac-curl	8m 27s
build-test-client-windows	15m 53s
	1h 2m 42s

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