Stream breaking when an object is updated then deleted in the same change_stream using LOG_BASED

[Joseph-A-Pearson]

When an object has been updated and then deleted between two change stream accesses, the fullDocument comes through as None, for the ’update event as there is no object to lookup. this causes the setting of the object_id field to fail as python can’t iterate through a null object.

The object:
{'_id': {'_data': '826540D20E000000832B022C0100296E5A1004B1454DE22CBD4CED99EDB1A716A6B5E546645F696400646540D20E7B1D780057B2BEAC0004'}, 'operationType': 'update', 'clusterTime': Timestamp(1698746894, 131), 'fullDocument': None, 'ns': {'db': 'api-services-core', 'coll': 'challenges'}, 'documentKey': {'_id': ObjectId('6540d20e7b1d780057b2beac')}, 'updateDescription': {'updatedFields': {'updatedAt': datetime.datetime(2023, 10, 31, 10, 8, 14, 893000), 'sources.device': {'distance': 0}}, 'removedFields': [], 'truncatedArrays': []}}

and the error:

stderr string_id=tap-mongodb-uk-prod
2023-11-01T09:37:03.589083Z [info     ]     object_id: Optional[ObjectId] = document["_id"] if "_id" in document else None cmd_type=elb consumer=False name=tap-mongodb-uk-prod producer=True stdio=stderr string_id=tap-mongodb-uk-prod
2023-11-01T09:37:03.589213Z [info     ] TypeError: argument of type 'NoneType' is not iterable cmd_type=elb consumer=False name=tap-mongodb-uk-prod producer=True stdio=stderr string_id=tap-mongodb-uk-prod