Fix the error handling for pydot installation check. #763
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`pydot.InvocationException` is only in `pydot_ng` and not in the `pydot` library. PiperOrigin-RevId: 613787427
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pydot.InvocationExceptionis only inpydot_ngand not in thepydotlibrary.PiperOrigin-RevId: 613787427