Weird error handling in training

Errors that are raised in run_exercises during the execution of an exercise are handled in a way inconsistent with the typing of the method, https://github.com/RLBot/RLBot/blob/master/src/main/python/rlbot/training/training.py#L167 passes an exception to the grade field in result, which is typed as Grade = Union[Pass, Fail].

Having something print in the terminal would also be a nice enhancement as well as making the function consistent with its definition.

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