Books with no page object (not set to null) are causing 500 errors

[mviencek]

Some books are not getting created correctly. There is no page object set to null. Like this one

{
"id": "f7603c88-278c-4211-bfc8-549644172954",
"description": "This thought-provoking French children's book teaches lessons about life and human nature.",
"author": " Antoine de Saint-Exupery",
"cover_image": null,
"title": "The Little Prince",
"pages": null,
"_rid": "QO9LAPsfmOM-AAAAAAAAAA==",
"_self": "dbs/QO9LAA==/colls/QO9LAPsfmOM=/docs/QO9LAPsfmOM-AAAAAAAAAA==/",
"_etag": ""00004897-0000-0000-0000-5c8410c40000"",
"_attachments": "attachments/",
"_ts": 1552158916
}

some are like this one

{
"id": "420797f2-7bd1-416d-9f18-e5680175a4bb",
"description": "The second book in the series about the battle for Middle Earth.",
"author": "JRR Tolkien",
"title": "The Two Towers",
"_rid": "QO9LAPsfmOMzAAAAAAAAAA==",
"_self": "dbs/QO9LAA==/colls/QO9LAPsfmOM=/docs/QO9LAPsfmOMzAAAAAAAAAA==/",
"_etag": ""39003d8d-0000-0000-0000-5c7e02fe0000"",
"_attachments": "attachments/",
"_ts": 1551762174
}

[mviencek]

Modify code to handle malformed book objects. Deployed to my one box and tested.
Total time 2 hrs