code: def build_column(self, data):
      value = get_replacement_value(self.cfg, "value")
      return data[self.col].replace(r"^\s+$", value, regex=True)
  
imports: import re
  import numpy
  import pandas
  from six import string_types
  import dtale.global_state
  from dtale.column_builders import ReplaceColumnBuilder
  from dtale.utils import classify_type, find_dtype, dict_merge
label_desc: Use image node_id 2 for calling the SpaceReplacement obj's underlying member method code with example usage: obj.build_column(data) and returns: data