class_docstr: Raised when a required params is not defined
class_docstr_tok: ["Raised","when","a","required","params","is","not","defined"]
code: def __init__(self, att_name):
      message = "The '{}' is required but not defined.".format(att_name)
      Exception.__init__(self, message)
      self.message = message
  
label_desc: Use image node_id 1 to create a new UndefinedRequiredParams object from inherited base classes: Exception with example: obj = UndefinedRequiredParams(att_name)