docs: def has_preview(self):
          """stub"""
          # I had to add the following check because file record types don't seem to be implemented
          # correctly for raw edx Question objects
          if ('fileIds' not in self.my_osid_object._my_map or
                  'preview' not in self.my_osid_object._my_map['fileIds'] or
                  self.my_osid_object._my_map['fileIds']['preview'] is None):
              return False
          return bool(self.my_osid_object._my_map['fileIds']['preview'])