def empty_if_none(fn):

  def wrapper(value):

    if value is None:
      return ''
    return fn(value)

  return wrapper


# Key helpers.
Create an index to speed up queries on a table.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/bulkload/transform.py/empty_if_none--crossover with--dataset/ETHPy150Open pudo/dataset/dataset/persistence/table.py/Table.create_index