Cannot create null jsonBody

[chaoky]

I thinks it's expected of a initResponse with a jsonBody of null to be serialized to "null", like in JSON.stringfy,
but it's being treated as undefined, and no body or header is being set

[hallvictoria]

Hi @chaoky, thanks for this. We'll need to do some testing to ensure this doesn't affect any existing scenarios, but we hope to get this change in @azure/functions version 4.7.0 or 4.8.0. Loose ETA is late February - early March, and I'll post here if there are any delays.