RFR: 1854: Add "clean" label for merge PRs that have no merge resolution [v3]

[Zhao Song]

On Wed, 12 Apr 2023 23:01:28 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix a problem
>
> vcs/src/main/java/org/openjdk/skara/vcs/Repository.java line 186:
> 
>> 184:     }
>> 185: 
>> 186:     boolean isEmptyCommit(Hash hash);
> 
> We should add a javadoc comment describing the expected behavior for this method, specifically for merge commits.

NVM, I misunderstood your comment

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PR Review Comment: https://git.openjdk.org/skara/pull/1500#discussion_r1164755479