Merge pull request #1 from anay-p/patch-1

Change self.vectors to be initialized as None instead of as an empty list

hyperdb/hyperdb.py

@@ -57,7 +57,7 @@ def __init__(
     ):
         documents = documents or []
         self.documents = []
-        self.vectors = []
+        self.vectors = None
         self.embedding_function = embedding_function or (
             lambda docs: get_embedding(docs, key=key)
         )