Unknown mode for null_model

[brian-j-smith]

An "unknown" value for the mode argument of null_model() produces the error below even thought the documentation states this is a possible value.

parsnip::null_model(mode = "unknown")
#> Error in `parsnip::null_model()`:
#> ! `mode` should be one of: 'classification', 'regression'

[simonpcouch]

Thanks for bringing this up! Addressed in #983.

[brian-j-smith]

Thanks!

[github-actions]

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