Merge pull request #305 from kjsanger/fix/print-null-checksum #202

Job	Run time
build (4.2.7, ghcr.io/wtsi-npg/ub-16.04-irods-clients-dev-4.2.7:latest, ghcr.io/wtsi-npg/ub-16.04...	3m 45s
build (4.2.11, ghcr.io/wtsi-npg/ub-18.04-irods-clients-dev-4.2.11:latest, ghcr.io/wtsi-npg/ub-18....	5m 34s
build (4.2.12, ghcr.io/wtsi-npg/ub-18.04-irods-clients-dev-4.2.12:latest, ghcr.io/wtsi-npg/ub-18....	5m 37s
build (4.3.1, ghcr.io/wtsi-npg/ub-22.04-irods-clients-dev-4.3.1:latest, ghcr.io/wtsi-npg/ub-22.04...	5m 50s
build (4.3.2, ghcr.io/wtsi-npg/ub-22.04-irods-clients-dev-4.3.2:latest, ghcr.io/wtsi-npg/ub-22.04...	5m 57s
build (4.3.3, ghcr.io/wtsi-npg/ub-22.04-irods-clients-dev-4.3.3:latest, ghcr.io/wtsi-npg/ub-22.04...	6m 32s
	33m 15s

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