chore: Update persist_directory parameter to handle None value in ChromaSearch and Chroma components (#2157)

* chore: Update persist_directory parameter to handle None value in ChromaSearch and Chroma components

* 🐛 (test_endpoints.py): fix assertion to check for correct key name in output results for chat and any input types

src/backend/base/langflow/components/vectorsearch/ChromaSearch.py

@@ -3,7 +3,6 @@ from typing import List, Optional
 import chromadb
 from chromadb.config import Settings
 from langchain_chroma import Chroma
-
 from langflow.components.vectorstores.base.model import LCVectorStoreComponent
 from langflow.field_typing import Embeddings, Text
 from langflow.schema import Record
@@ -104,10 +103,11 @@ class ChromaSearchComponent(LCVectorStoreComponent):
             client = chromadb.HttpClient(settings=chroma_settings)
         if index_directory:
             index_directory = self.resolve_path(index_directory)
+
         vector_store = Chroma(
             embedding_function=embedding,
             collection_name=collection_name,
-            persist_directory=index_directory,
+            persist_directory=index_directory or None,
             client=client,
         )
 

src/backend/base/langflow/components/vectorstores/Chroma.py

@@ -7,7 +7,6 @@ from langchain_chroma import Chroma
 from langchain_core.embeddings import Embeddings
 from langchain_core.retrievers import BaseRetriever
 from langchain_core.vectorstores import VectorStore
-
 from langflow.base.vectorstores.utils import chroma_collection_to_records
 from langflow.custom import CustomComponent
 from langflow.schema import Record
@@ -107,7 +106,7 @@ class ChromaComponent(CustomComponent):
             index_directory = self.resolve_path(index_directory)
 
         chroma = Chroma(
-            persist_directory=index_directory,
+            persist_directory=index_directory or None,
             client=client,
             embedding_function=embedding,
             collection_name=collection_name,