docs: def _check_state_value(cls):
          """Check initial state value - if is proper and translate it.
  
          Initial state is required.
          """
          state_value = cls.context.get_config('initial_state', None)
          state_value = state_value or getattr(
              cls.context.new_class, cls.context.state_name, None
          )
  
          if not state_value:
              raise ValueError(
                  "Empty state is disallowed, yet no initial state is given!"
              )
          state_value = (
              cls.context
              .new_meta['translator']
              .translate(state_value)
          )
          cls.context.state_value = state_value