[MPG][Diff] SDK from Typespec still generate model when model defines no property

[msyyc]

Compared with SDK between typespec and swagger, typespec definition has a model which has no property:

• typespec sdk
  
  

• swagger sdk
  

[iscai-msft]

Python is in an interesting situation, where since our models are also a dictionary type, it wouldn't be breaking for us if we took empty models and generated them as dictionaries, then when later properties were added we would generate a model. I don't think tcgc should return empty models as dictionaries, but I could be open to python generating these empty models as dictionaries. However, I still think it's better to not do any magic here: is it breaking mgmt if we just return empty models? I don't believe it is bc our models are dictionaries

[msyyc]

I don't think it is a problem for Python, either. Since we only release SDK from typespec for green field service, it is not breaking for python. I agree that we just keep current logic.

[tadelesh]

opened discussion for TCGC: Azure/typespec-azure#846

[tadelesh]

Swagger	m4	Python
"XXX": {"type": "object"}	anyObject	JSON
"XXX": {}	any	Any

please help to confirm the python behavior @msyyc @iscai-msft @lmazuel @johanste

TypeSpec	TCGC	Python
{}	anonymous model with no properties	Any
model EmptyModel {}	named model with no properties	class EmptyModel: ...
unknown	any	Any