code: def add_text(text_list, sep):
      """
      return int, number of digits to display
  
      Parameters
      ----------
      text_list : list
          list of text elements to concat
      sep: str
          separatator
  
      Returns
      -------
      int
          number of digits
      """
      clean_list = [x for x in text_list if x not in ["", None]]
      return sep.join(clean_list)
  
file_path: shapash/shapash/utils/utils.py
imports: import numpy
  import pandas
  import socket
  import math
  from shapash.explainer.smart_state import SmartState
  from shapash.explainer.multi_decorator import MultiDecorator
label_desc: Use image node_id 8 for calling a global function with example usage: add_text(text_list, sep) and returns: sep