Refactor process_inputs function to handle optional inputs and artifacts

src/backend/langflow/processing/process.py

@@ -7,11 +7,12 @@ from langchain.schema import AgentAction, Document
 from langchain.vectorstores.base import VectorStore
 from langchain_core.messages import AIMessage
 from langchain_core.runnables.base import Runnable
+from loguru import logger
+from pydantic import BaseModel
+
 from langflow.interface.custom.custom_component import CustomComponent
 from langflow.interface.run import build_sorted_vertices, get_memory_key, update_memory_keys
 from langflow.services.deps import get_session_service
-from loguru import logger
-from pydantic import BaseModel
 
 
 def fix_memory_inputs(langchain_object):
@@ -106,9 +107,13 @@ def get_build_result(data_graph, session_id):
     return build_sorted_vertices(data_graph)
 
 
-def process_inputs(inputs: Union[dict, List[dict]], artifacts: Dict[str, Any]) -> dict:
+def process_inputs(
+    inputs: Optional[Union[dict, List[dict]]] = None, artifacts: Optional[Dict[str, Any]] = None
+) -> Union[dict, List[dict]]:
     if inputs is None:
         inputs = {}
+    if artifacts is None:
+        artifacts = {}
 
     if isinstance(inputs, dict):
         inputs = update_inputs_dict(inputs, artifacts)