Example fails

Hi your base example seems to fail to produce `cluster_labels`, and subsequently causes `cc.show()` to fail.

Your example,
NOTE: Using GPU, not summarizing

```python
from src.text_clustering import ClusterClassifier
from datasets import load_dataset

SAMPLE = 100_000

texts = load_dataset("HuggingFaceTB/cosmopedia-100k", split="train").select(range(SAMPLE))["text"]

cc = ClusterClassifier(embed_device="cuda", summary_create=False)

# run the pipeline:
embs, labels, summaries = cc.fit(texts)

# show the results
cc.show()
```