error in metric functions for cluster_spec

[EmilHvitfeldt]

Current:

library(tidyclust)

spec <- k_means(num_clusters = 4)

sse_ratio(spec)
#> Error in UseMethod("sse_ratio"): no applicable method for 'sse_ratio' applied to an object of class "c('k_means', 'cluster_spec', 'unsupervised_spec')"

This PR:

library(tidyclust)

spec <- k_means(num_clusters = 4)

sse_ratio(spec)
#> Error in `sse_ratio()`:
#> ! This function requires a fitted model. Please use `fit()` on your cluster specification.

[github-actions]

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