Exception: toJson() method have to add to FormData

[DjordjeMancic97]

Describe the bug Trying to send POST request with content-type "multipart/form-data" which contains a single image. Function looks like this:

@POST('url') @MultiPart() Future<ResponseModel> uploadImage({ @Part() required FormData image });

When running the generator I get: Exception: toJson() method have to add to FormData

To Reproduce Just try running generator for supplied function.

Expected behavior Generation should complete successfully

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