code: def validate(self, required_props):
          
          missing_props = [p for p in required_props if not getattr(self, p)]
          if missing_props:
              missing_props_str = ', '.join(sorted(missing_props))
              raise InvalidApplicationMetadataError(properties=missing_props_str)
          return True
docs: Check if the required application metadata properties have been populated.
  
          :param required_props: List of required properties
          :type required_props: list
          :return: True, if the metadata is valid
          :raises: InvalidApplicationMetadataError