Make changes for datasets with only one file (#335) #794

Job	Run time
allowed-fail-tests / Load tox environments	3s
tests / Load tox environments	7s
allowed-fail-tests / py311-devdeps (ubuntu-latest)	4m 42s
tests / py312 (ubuntu-latest)	5m 27s
tests / py311 (ubuntu-latest)	4m 1s
tests / py310-online (windows-latest)	8m 28s
tests / py39 (macos-latest)	8m 25s
tests / build_docs (ubuntu-latest)	11m 1s
tests / py39-oldestdeps (ubuntu-latest)	4m 38s
publish / Build source and wheel distribution	4m 16s
notify	0s
	51m 8s

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