The `plot_pattern()` function produces an error if there is a variable called `y`

[Hanne Oberman]

ggmice::plot_pattern(cbind(y = NA, mice::nhanes))
#> Error in `.data$y`:
#> ! Column `y` not found in `.data`.

^{Created on 2022-03-21 by the reprex package (v2.0.1)}