message: Throw error message when the model can't be initialized during calibration.
diff: @@ -40,8 +40,8 @@ PYBIND11_MODULE(_pywrap_tensorflow_lite_calibration_wrapper, m) {
  std::string error;
  auto* wrapper = ::CalibrationWrapper::CreateWrapperCPPFromBuffer(
  data.ptr(), registerers_by_name, registerers_by_func, &error);
  - if (PyErr_Occurred()) {
  - throw py::error_already_set();
  + if (!wrapper) {
  + throw std::invalid_argument(error); // throws ValueError in Python
  }
  return wrapper;
  }))
  