Don't generate a spurious NullNode after parsing an embedded object.

[philipa]

Add missing break statement.

I found this while playing with CBOR:

        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final CBORFactory factory = new CBORFactory(new ObjectMapper());
        final CBORGenerator g = factory.createGenerator(baos);

        g.writeStartArray();
        g.writeBinary(new byte[] { 0x10 });
        g.writeEndArray();
        g.close();

        final TreeNode tree = factory.createParser(baos.toByteArray()).readValueAsTree();
        System.out.println(tree); // ["EA==",null]

[cowtowncoder]

Ah, good catch! I'll also backport it to older versions.