code: def handle_none(
      self, data: dict[str, Any], **kwargs: Any
  ) -> dict[str, Any]:
      if data is None:
          return {}
      return data
  
file_path: superset/superset/views/datasource/schemas.py
imports: from typing import Any, Optional, TypedDict
  from marshmallow import fields, post_load, pre_load, Schema, validate
  from superset import app
  from superset.charts.schemas import ChartDataExtrasSchema, ChartDataFilterSchema
  from superset.utils.core import DatasourceType
label_desc: Use image node_id 1 for calling the SamplesPayloadSchema obj's underlying member method code with example usage: obj.handle_none(data) and returns: data, dict