adding `shade_*(NULL)` results in `list()` return value

[simonpcouch]

library(infer)
  
gss_permute <- 
  tibble::as_tibble(gss) |>
  dplyr::filter(!(is.na(sex) | is.na(college))) |>
  dplyr::mutate(partyid = as.character(partyid)) |>
  dplyr::filter(partyid %in% c("ind", "rep", "dem"))|>
  specify(college ~ sex, success = "no degree") |>
  hypothesize(null = "independence") |>
  generate(reps = 100, type = "permute") |>
  calculate(stat = "z", order = c("female", "male"))

gss_permute |> visualize(method = "simulation")

  
gss_permute |> visualize(method = "simulation") + shade_confidence_interval(NULL)
#> list()

^{Created on 2025-12-12 with reprex v2.1.1}

Same goes for shade_p_value().