Print for translated spec fails for `null_model()`

[hfrick]

library(parsnip)

null_model() %>% 
  set_engine("parsnip") %>% 
  set_mode("regression") 
#> Null Model Specification (regression)
#> 
#> Computational engine: parsnip

null_model() %>% 
  set_engine("parsnip") %>% 
  set_mode("regression") %>% 
  translate()
#> Null Model Specification (regression)
#> 
#> Computational engine: parsnip 
#> 
#> Model fit template:
#> Error in `call2()` at parsnip/R/misc.R:111:2:
#> ! `ns` must be a string

^{Created on 2022-06-12 by the reprex package (v2.0.1)}

[github-actions]

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