fix: clean up two unreachable code (#20773)

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

api/core/rag/datasource/vdb/oracle/oraclevector.py

@@ -303,7 +303,6 @@ class OracleVector(BaseVector):
             return docs
         else:
             return [Document(page_content="", metadata={})]
-        return []
 
     def delete(self) -> None:
         with self._get_connection() as conn:

api/core/tools/utils/dataset_retriever/dataset_multi_retriever_tool.py

@@ -153,8 +153,6 @@ class DatasetMultiRetrieverTool(DatasetRetrieverBaseTool):
             return str("\n".join(document_context_list))
         return ""
 
-        raise RuntimeError("not segments found")
-
     def _retriever(
         self,
         flask_app: Flask,