RFR: 1393: PR bot fails on missing .jcheck/conf

[Zhao Song]

On Tue, 1 Nov 2022 17:32:05 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> Maybe it would be even better to throw an exception instead of returning Optional.empty(). We can't recover from it in CheckWorkItem anyway, and with a typed exception we can communicate more exactly what went wrong, and we can catch exactly that exception type and write the message.

I thought about it in the very beginning and I found that  if we choose to throw an exception, we will need to surround a lot of code with try catch because the scope of `census` is big.

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PR: https://git.openjdk.org/skara/pull/1407