Fix issue #206

[lgaborini]

Just a minor typo, the code in the issue #206 now works.

I can't find any test with a tune() within hier_clust() model, am I correct?

[EmilHvitfeldt]

Hello @lgaborini 👋

Thanks for writing the PR, it does appear there isn't a test. Are you up for adding one in this PR?

[lgaborini]

Sure! Should I duplicate each test in tests/testthat/test-tune_cluster.R to test hier_clust(), or is it overkill?

[EmilHvitfeldt]

definately overkill. I would suggest you add a single test in test-hier_clust-stats.R with some code that didn't work before this PR, but works after.

[lgaborini]

Thanks! I added the smallest possible test.