feat(langflow): Handle ChromaDB NotEnoughElementsException

This change adds error handling to catch a specific exception that may occur when processing documents with the ChromaDB library. If there are not enough documents for indexing, the error message will suggest reducing the chunk size in TextSplitter.

src/backend/langflow/interface/run.py

@@ -1,6 +1,7 @@
 import contextlib
 import io
 from typing import Any, Dict
+from chromadb.errors import NotEnoughElementsException
 
 from langflow.cache.utils import compute_dict_hash, load_cache, memoize_dict
 from langflow.graph.graph import Graph
@@ -230,6 +231,10 @@ def get_result_and_thought_using_graph(langchain_object, message: str):
             else:
                 thought = output_buffer.getvalue()
 
+    except NotEnoughElementsException as exc:
+        raise ValueError(
+            "Error: Not enough documents for ChromaDB to index. Try reducing chunk size in TextSplitter."
+        ) from exc
     except Exception as exc:
         raise ValueError(f"Error: {str(exc)}") from exc
     return result, thought