step_dummy with no variable selected

[topepo]

@kjell-stattenacity In cases where step_dummy() receives no variables, it should not just fail.

library(tidymodels)

zdat <- tibble(
  y = c(1, 2, 3), 
  x = c("a", "a", "a"),
  z = 3:1
  )

transform_recipe2 <- recipe(y ~ x, data = zdat) %>%
  step_zv(all_predictors()) %>% 
  step_dummy(all_predictors()) %>%
  prep(training = zdat)

[topepo]

Changes have been checked in if you want to test

[github-actions]

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