message: fix the for statement in creating hypers.
diff: @@ -559,7 +559,7 @@ class OptimizerV2(checkpointable.Checkpointable):
  self._weights.append(self._iterations)
  for name, value in self._hyper.items():
  if isinstance(value, ops.Tensor) or callable(value):
  - pass
  + continue
  else:
  self._hyper[name] = self.add_weight(
  name,
  