ENH: Catch warning when loaded text file contains no data in test #658

Job	Run time
Build & verify package	34s
checks (style)	21s
test (ubuntu-latest, 3.9, latest, x64)	4m 28s
checks (spellcheck)	17s
test (ubuntu-latest, 3.10, latest, x64)	5m 58s
checks (typecheck)	1m 13s
test (ubuntu-latest, 3.11, latest, x64)	4m 40s
test (ubuntu-latest, 3.12, latest, x64)	5m 28s
test (ubuntu-latest, 3.13, latest, x64)	5m 20s
test (ubuntu-latest, 3.9, min)	5m 26s
Publish released package to pypi.org	0s
	33m 45s

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