Prevent a Session from being closed multiple times #660
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Currently, the Flask API does not work correctly with the Flask.test_client() method when used multiple times.
The reason for that is that due to the teardown hook added in pony/flask/init.py gets called after each time the test_client gets exited. However, the db_session got closed before already after the request, leading to two calls to session.exit(). This in turn will force the local context counter to go negative, so that the next call will fail with assert not context_counter...