HDBSCAN bug fix

app/summarizer.py

@@ -27,6 +27,12 @@ class Summarizer:
 
 
     def cluster_sentences(self, sentences, embeddings, min_cluster_size=2):
+        # HDBSCAN requires more than one sentence
+        if not sentences:
+            return []
+        if len(sentences) == 1:
+            return [[(sentences[0], embeddings[0])]]
+
         hdb = HDBSCAN(min_cluster_size=min_cluster_size).fit(embeddings)
 
         clusters = {}