Error when the number of components is zero

[zhiyintan]

When length of self.component_vectors = 0 (hdbscan_min_cluster_size/hdbscan_min_samples is set too large)

IndexError: list index out of range

semantic_components/semantic_components/decomposition.py

Line 511 in e5c1c58

return self.component_vectors[i]

[eichinflo]

Thank you for bringing this to our attention! In your opinion: What would be the expected behavior if a representation of a non-existent component is requested here? Thinking about it, throwing a more expressive error message is probably the correct behavior.

What I am also concerned about is the naming of the function as "representation" here refers to the cluster centroid and not a c-tf-idf representation. I think I'll rename this and also add a function to the SCA class that offers the same functionality of exposing the cluster centroids.

[eichinflo]

I've just added some lines to address the first part of this.