message: In constant op test, do not proceed further if op creation fails.
diff: @@ -60,6 +60,7 @@ void ConstantOpTest::PersistentMemoryTrackingTest(bool on_gpu) {
  std::unique_ptr<OpKernel> op(CreateOpKernel(device_type, device.get(),
  cpu_allocator(), const_node,
  TF_GRAPH_DEF_VERSION, &status));
  + TF_ASSERT_OK(status);
  OpKernelContext::Params params;
  params.device = device.get();
  