Allow SQLAlchemy class mapping errors to propagate#281

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MPickfield wants to merge 3 commits intographql-python:masterfrom

MPickfield:master

Commits on Jul 27, 2020

Alerted is_mapped_class to allow the original sqlalchemy error to propogate.
Mike Pickfield
committed
Removed unused import (promise.Promise)
Mike Pickfield
committed
sorted imports in test_types
Mike Pickfield
committed