code: def is_all_field_none(self):
          
  
          if self._attachment_public_uuid is not None:
              return False
  
          if self._content_type is not None:
              return False
  
          if self._height is not None:
              return False
  
          if self._width is not None:
              return False
  
          return True
docs: :rtype: bool