add comments and clearer error messages

Author: SaraCalla

integrations/chroma/src/haystack_integrations/document_stores/chroma/document_store.py

@@ -111,12 +111,13 @@ def _ensure_initialized(self):
                 )
                 raise ValueError(error_message)
 
+            # Use dict to conditionally pass settings because Chroma doesn't accept settings=None
             client_kwargs: dict[str, Any] = {}
             if self._client_settings:
                 try:
                     client_kwargs["settings"] = Settings(**self._client_settings)
                 except ValueError as e:
-                    msg = f"Invalid client_settings: {e}"
+                    msg = f"Invalid client_settings ({self._client_settings}): {e}"
                     raise ValueError(msg) from e
 
             if self._host and self._port is not None:
@@ -166,12 +167,13 @@ async def _ensure_initialized_async(self):
                 )
                 raise ValueError(error_message)
 
+            # Use dict to conditionally pass settings because Chroma doesn't accept settings=None
             client_kwargs: dict[str, Any] = {}
             if self._client_settings:
                 try:
                     client_kwargs["settings"] = Settings(**self._client_settings)
                 except ValueError as e:
-                    msg = f"Invalid client_settings: {e}"
+                    msg = f"Invalid client_settings ({self._client_settings}): {e}"
                     raise ValueError(msg) from e
 
             client = await chromadb.AsyncHttpClient(