Fix CRIU

- process.Init#io could be nil
- Make sure CreateTaskRequest#Options is not empty before unmarshaling

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

runtime/v2/runc/container.go

@@ -49,7 +49,7 @@ func NewContainer(ctx context.Context, platform stdio.Platform, r *task.CreateTa
 	}
 
 	var opts options.Options
-	if r.Options != nil {
+	if r.Options != nil && r.Options.GetTypeUrl() != "" {
 		v, err := typeurl.UnmarshalAny(r.Options)
 		if err != nil {
 			return nil, err