visidata-ci-build

[html] prevent error when parsing an empty table #1061

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Run time

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Job	Run time
run-tests (3.7)	2m 18s
run-tests (3.8)	2m 22s
run-tests (3.9)	2m 17s
run-tests (3.10)	2m 19s
run-tests (3.11)	2m 17s
	11m 33s