message: fixed support for 4.15
diff: @@ -950,8 +950,10 @@ PyObject *py_ue_skeletal_mesh_register_morph_target(ue_PyUObject *self, PyObject
  if (!morph)
  return PyErr_Format(PyExc_Exception, "argument is not a MorphTarget");
  +#if ENGINE_MINOR_VERSION > 15
  if (!morph->HasValidData())
  return PyErr_Format(PyExc_Exception, "the MorphTarget has no valid data");
  +#endif
  #if WITH_EDITOR
  mesh->PreEditChange(nullptr);
  @@ -1007,12 +1009,16 @@ PyObject *py_ue_morph_target_populate_deltas(ue_PyUObject *self, PyObject * args
  morph->PopulateDeltas(deltas, lod_index);
  +#if ENGINE_MINOR_VERSION > 15
  if (morph->HasValidData())
  {
  Py_RETURN_TRUE;
  }
  Py_RETURN_FALSE;
  +#else
  + Py_RETURN_TRUE;
  +#endif
  }
  PyObject *py_ue_morph_target_get_deltas(ue_PyUObject *self, PyObject * args)
  