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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Optional[datetime] field with value null/None gets isoparse'd","articleBody":"I have a field in my generated model like this:\r\n\r\n```timestamp: Union[Unset, datetime.datetime] = UNSET```\r\n\r\nMy API returns {\"timestamp\": null}, which then gets deserialized as None, and ends up in the else clause of this generated code:\r\n\r\n```\r\n        if isinstance(_timestamp, Unset):\r\n            timestamp = UNSET\r\n        else:\r\n            timestamp = isoparse(_timestamp)\r\n```\r\n\r\n.. when then ends up raising in dateutil's isoparser.py.\r\n\r\nI'm using 0.10.1 and saw https://github.com/openapi-generators/openapi-python-client/issues/381 and https://github.com/openapi-generators/openapi-python-client/pull/420 - wondering if `datetime.datetime` wasn't fixed with that issue or if I'm doing something wrong?\r\n","author":{"url":"https://github.com/cfal","@type":"Person","name":"cfal"},"datePublished":"2021-07-21T18:10:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/456/openapi-python-client/issues/456"}