message: Take custom options only when the given op is actually a custom op.
diff: @@ -311,6 +311,7 @@ TfLiteStatus InterpreterBuilder::ParseNodes(
  EnumNameBuiltinOperator(op_type));
  }
  + if (op_type == BuiltinOperator_CUSTOM) {
  if (op->custom_options()) {
  subgraph->AddNodeWithParameters(
  FlatBufferIntArrayToVector(op->inputs()),
  @@ -318,6 +319,13 @@ TfLiteStatus InterpreterBuilder::ParseNodes(
  FlatBufferIntArrayToVector(op->intermediates()),
  reinterpret_cast<const char*>(op->custom_options()->data()),
  op->custom_options()->size(), nullptr, registration);
  + } else {
  + subgraph->AddNodeWithParameters(
  + FlatBufferIntArrayToVector(op->inputs()),
  + FlatBufferIntArrayToVector(op->outputs()),
  + FlatBufferIntArrayToVector(op->intermediates()), nullptr, 0,
  + nullptr, registration);
  + }
  } else {
  void* builtin_data = nullptr;
  MallocDataAllocator malloc_allocator;
  