`translate()` print method fails uninformatively when extension isn't loaded

[simonpcouch]

library(parsnip)

C5_rules() %>% translate("C5.0")
#> C5.0 Model Specification (classification)
#> 
#> Computational engine: C5.0 
#> 
#> Model fit template:
#> Error in `call2()`:
#> ! Can't create call to non-callable object

library(rules)

C5_rules() %>% translate("C5.0")
#> C5.0 Model Specification (classification)
#> 
#> Computational engine: C5.0 
#> 
#> Model fit template:
#> rules::c5_fit(x = missing_arg(), y = missing_arg(), weights = missing_arg())

^{Created on 2022-05-22 by the reprex package (v2.0.1)}

[github-actions]

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