Bug Report Checklist
Description
When invoking a Python API to create a composed model, the following error is raised:
UnboundLocalError: local variable 'obj_dict' referenced before assignment
I think this is because at this line, we are missing a condition for ModelComposed:
modules/openapi-generator/src/main/resources/python/python-experimental/api_client.mustache:249
openapi-generator version
master March 6th 2020
OpenAPI declaration file content or url
Command line used for generation
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