tidy.recipe() throws error for zero-step recipes

[EmilHvitfeldt]

tidy.recipe() should return a zero row tibble for empty recipes instead of throwing an error. This is making step_detect() error when used on empty recipes.

library(recipes)

recipe(~., data = mtcars) %>%
  step_center(all_predictors()) %>%
  tidy()
#> # A tibble: 1 × 6
#>   number operation type   trained skip  id          
#>    <int> <chr>     <chr>  <lgl>   <lgl> <chr>       
#> 1      1 step      center FALSE   FALSE center_uXNNk

recipe(~., data = mtcars) %>%
  tidy()
#> Error: No steps in recipe.

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