visidata-ci-build

[fixed-] use empty str for null_value in fixed width sheet #1983

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Job	Run time
run-tests (3.8)	1m 52s
run-tests (3.9)	2m 30s
run-tests (3.10)	1m 48s
run-tests (3.11)	1m 38s
run-tests (3.12)	1m 42s
run-tests (3.13)	1m 50s
	11m 20s