[skara] RFR: pr: handle exceptions for commit commands [v2]

[Erik Helin]

On Mon, 15 Feb 2021 13:02:05 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> ... it may be prudent to change processedCommitComments to a concurrent type now that it can be accessed from another context.

Good idea, I pushed a commit that changes the `HashSet<String>` to `ConcurrentHashMap<String, Boolean>` ��

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PR: https://git.openjdk.java.net/skara/pull/1017