Unexpected missing values in `data_tabulate()` #1788

Job	Run time
R-CMD-check / macOS-latest (release)	3m 39s
R-CMD-check / windows-latest (devel)	8m 18s
R-CMD-check / windows-latest (release)	7m 34s
R-CMD-check / windows-latest (oldrel)	12m 14s
R-CMD-check / windows-latest (4.1)	9m 33s
R-CMD-check / ubuntu-latest (devel)	6m 27s
R-CMD-check / ubuntu-latest (release)	5m 43s
R-CMD-check / ubuntu-latest (4.3)	5m 35s
R-CMD-check / ubuntu-latest (4.2)	1m 5s
R-CMD-check / ubuntu-latest (4.1)	52s
R-CMD-check / ubuntu-latest (4.0)	1m 7s
	1h 2m 7s

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