Song object does not have all properties

[kingofzeal]

Sample object from the API:

{
                    "rating": 4.2,
                    "sid": 3,
                    "link_text": "danielbrown.vgpiano.com",
                    "fave": null,
                    "origin_sid": 3,
                    "elec_blocked": true,
                    "entry_id": 8370914,
                    "groups": [
                        {
                            "id": 4702,
                            "name": "Castlevania (All)"
                        }
                    ],
                    "year": null,
                    "albums": [
                        {
                            "rating_user": 3.8,
                            "rating": 4,
                            "art": "/static/baked/album_art/3_1105",
                            "name": "Daniel Brown's Castlevania",
                            "rating_complete": false,
                            "fave": null,
                            "id": 1105
                        }
                    ],
                    "entry_position": 0,
                    "id": 9670,
                    "cool": false,
                    "rating_user": 4.5,
                    "elec_request_user_id": 0,
                    "title": "Heart of Fire",
                    "url": "http://danielbrown.vgpiano.com/castlevania.htm",
                    "entry_type": 2,
                    "disc_number": null,
                    "track_number": null,
                    "artists": [
                        {
                            "order": 0,
                            "id": 10370,
                            "name": "Daniel Brown"
                        }
                    ],
                    "elec_blocked_by": "in_election",
                    "length": 129,
                    "rating_count": 53,
                    "artist_parseable": "[{\"id\": 10370, \"name\": \"Daniel Brown\"}]",
                    "request_count": 80,
                    "entry_votes": 0,
                    "rating_allowed": true,
                    "elec_request_username": null
                }

We should verify the song object is fully populated with all these properties.