rownames_to_column() gives warning if used on data.frame with no columns

[EmilHvitfeldt]

The title says it all. rownames_to_column() gives a warning if used on data.frame with no columns, but works as intended if there are columns.

library(tibble)

a <- matrix(nrow = 1, ncol = 0)
rownames(a) <- "name"
a_df <- as.data.frame(a)

rownames_to_column(a_df)
#> Warning: The `.data` argument of `add_column()` must have unique names as of tibble 3.0.0.
#> Use `.name_repair = "minimal"`.
#> This warning is displayed once every 8 hours.
#> Call `lifecycle::last_warnings()` to see where this warning was generated.
#>   rowname
#> 1    name

^{Created on 2020-06-07 by the reprex package (v0.3.0)}

library(tibble)

a <- matrix(nrow = 1, ncol = 1)
rownames(a) <- "name"
a_df <- as.data.frame(a)

rownames_to_column(a_df)
#>   rowname V1
#> 1    name NA

^{Created on 2020-06-07 by the reprex package (v0.3.0)}

[krlmlr]

Thanks for reporting!

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