Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: widgetwalker

src/mcp/shared/session.py

@@ -432,17 +432,16 @@ async def _handle_session_message(message: SessionMessage) -> None:
                         # Fix #1401: Propagate exception to all pending requests
                         # This prevents waiters from hanging when the transport fails
                         error_data = (
-                            message.to_error_data() 
-                            if isinstance(message, MCPError) 
+                            message.to_error_data()
+                            if isinstance(message, MCPError)
                             else ErrorData(code=0, message=str(message))
                         )
-                        jsonrpc_error = JSONRPCError(jsonrpc="2.0", id=None, error=error_data) # id=None because it applies to all
-                        
+
                         # We must send an error to every individual waiter
                         for req_id, stream in list(self._response_streams.items()):
                             # Send a response with the correct ID
                             await stream.send(JSONRPCError(jsonrpc="2.0", id=req_id, error=error_data))
-                        
+
                         continue
 
                     await _handle_session_message(message)