code: def encryption_metadata_exists(md):
          # type: (dict) -> bool
          
          try:
              if blobxfer.util.is_not_empty(
                      md[EncryptionMetadata._METADATA_KEY_NAME]):
                  return True
          except (KeyError, TypeError):
              pass
          return False
docs: Check if encryption metadata exists in json metadata
          :param dict md: metadata dictionary
          :rtype: bool
          :return: if encryption metadata exists