[bug] caller error when interating over cls in factory.py

[joydeep049]

Related Discussion: nyunAI/nyuntam-vision#20 (comment)

In the create_from_dict() method in nyuntam/factory.py, the caller iterating over cls always throws an error. But if we do something like:

cls = get_factories(task, job_service)
if(cls[0]):
    return cls[0](args)
else:    
    raise Exception("Factory instance could not be created.")

This can be done because cls only has a single element. Also, it works locally.

cc @Akash-guna @Arnav0400