Make changes for datasets with only one file (#335) #790

Job	Run time
allowed-fail-tests / Load tox environments	4s
tests / Load tox environments	4s
tests / py312 (ubuntu-latest)	4m 50s
tests / py311 (ubuntu-latest)	3m 45s
tests / py310-online (windows-latest)	7m 19s
tests / py39 (macos-latest)	7m 42s
tests / build_docs (ubuntu-latest)	10m 56s
tests / py39-oldestdeps (ubuntu-latest)	5m 1s
allowed-fail-tests / py311-devdeps (ubuntu-latest)	5m 32s
publish / Build source and wheel distribution	4m 24s
notify	11s
	49m 48s

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