I recently noticed the new API documentation (looks very nice, btw) and observed that a lot of fields previously marked "some-type or null" in the old documentation no longer have the "or null" specified. However, API requests still supply null values where the new documentation does not specify that they will be there. I suspect there is some statement about nulls that I may have missed. Can someone provide a link, reference or statement that I can use as a guide in my app on where TMDB might supply null values unexpectedly or how I can know when to expect null values. That would be much appreciated.