fix type check stronger

llama-index-core/llama_index/core/multi_modal_llms/base.py

@@ -217,7 +217,7 @@ def _validate_component_inputs(self, input: Dict[str, Any]) -> Dict[str, Any]:
             if not isinstance(input["image_documents"], list):
                 raise ValueError("image_documents must be a list.")
             for doc in input["image_documents"]:
-                if not isinstance(doc, ImageDocument):
+                if not isinstance(doc, (ImageDocument, ImageNode)):
                     raise ValueError(
                         "image_documents must be a list of ImageNode objects."
                     )