code: def isBlank(self, string) -> bool:
      return not (string and string.strip())
  
imports: import datetime
  import logging
  from typing import Dict, List
  from MONAILabelReviewerLib.ImageData import ImageData
  from MONAILabelReviewerLib.MONAILabelReviewerEnum import Level
label_desc: Use image node_id 34 for calling the ImageDataExtractor obj's underlying member method code with example usage: obj.isBlank(string) and returns: unknown