@Override
    protected <T> byte[] toByteArray(T message, Schema<T> schema)
    {
        return ProtostuffIOUtil.toByteArray(message, schema, buf());
    }
Protostuff impl for {@link NullArrayElementTest}.

@author David Yu
@created Sep 29, 2014
protostuff-runtime/src/test/java/io/protostuff/runtime/ProtostuffNullArrayElementTest.java