docs: def _save_entry_field(self, field_type, entry):
          """This group packs a entry field"""
  
          if field_type == 0x0000:
              # Ignored
              pass
          elif field_type == 0x0001:
              if entry.uuid is not None:
                  return (16, entry.uuid)
          elif field_type == 0x0002:
              if entry.group_id is not None:
                  return (4, struct.pack('<I', entry.group_id))
          elif field_type == 0x0003:
              if entry.image is not None:
                  return (4, struct.pack('<I', entry.image))
          elif field_type == 0x0004:
              if entry.title is not None:
                  return (len(entry.title.encode())+1,
                           (entry.title+'\0').encode())
          elif field_type == 0x0005:
              if entry.url is not None:
                  return (len(entry.url.encode())+1, (entry.url+'\0').encode())
          elif field_type == 0x0006:
              if entry.username is not None:
                  return (len(entry.username.encode())+1,
                          (entry.username+'\0').encode())
          elif field_type == 0x0007:
              if entry.password is not None:
                  return (len(entry.password.encode())+1,
                          (entry.password+'\0').encode())
          elif field_type == 0x0008:
              if entry.comment is not None:
                  return (len(entry.comment.encode())+1,
                         (entry.comment+'\0').encode())
          elif field_type == 0x0009:
              if entry.creation is not None:
                  return (5, self._pack_date(entry.creation))
          elif field_type == 0x000A:
              if entry.last_mod is not None:
                  return (5, self._pack_date(entry.last_mod))
          elif field_type == 0x000B:
              if entry.last_access is not None:
                  return (5, self._pack_date(entry.last_access))
          elif field_type == 0x000C:
              if entry.expire is not None:
                  return (5, self._pack_date(entry.expire))
          elif field_type == 0x000D:
              if entry.binary_desc is not None:
                  return (len(entry.binary_desc.encode())+1,
                          (entry.binary_desc+'\0').encode())
          elif field_type == 0x000E:
              if entry.binary is not None:
                  return (len(entry.binary), entry.binary)
          return False