RFR: 1707: Bot warns about "No .jcheck/conf found" when it should not [v2]

[Zhao Song]

On Mon, 5 Dec 2022 23:00:40 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> I see some tests are failing and it looks related.

Yes, I will fix the tests. And I am also trying to make `HostedRepository::fileContents` returns `Optional<String>`. Is it ok to modify this time?

-------------

PR: https://git.openjdk.org/skara/pull/1435