add Exception to managed exception in hapic

tracim/__init__.py

     hapic.set_context(context)
     context.handle_exception(NotFound, 404)
     context.handle_exception(OperationalError, 500)
+    context.handle_exception(Exception, 500)
     # Add controllers
     session_api = SessionController()
     configurator.include(session_api.bind, route_prefix=BASE_API_V2)