RFR: Fix NPE in toString

Mon Aug 8 21:21:04 UTC 2022

On Mon, 8 Aug 2022 21:04:54 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> My patch in SKARA-1530 did unfortunately trigger NPE in the toString() methods of all subclasses of PullRequestWorkItem. This is because the pr field isn't initialized in the constructor anymore. The repository is available through the bot field however.

Thanks!

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PR: https://git.openjdk.org/skara/pull/1351