vcs: lookup does not handle non-existing commits

[edvbld]

Hi all,

please review this patch that makes ReadOnlyRepository.lookup handle hashes that do not exist in the repository. I also added a unit test for this scenario.

Thanks,
Erik

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Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed

Testing

	Linux x64	Windows x64	macOS x64
Build / test	⏳ (1/1 running)	✔️ (1/1 passed)	⏳ (1/1 running)

Reviewers

• Robin Westberg (@rwestberg - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/skara pull/898/head:pull/898
$ git checkout pull/898

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[mlbridge]

Webrevs

• 00: Full (2c938a3)

[rwestberg]

Looks good!

[openjdk]

@edvbld This change now passes all automated pre-integration checks.

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After integration, the commit message for the final commit will be:

vcs: lookup does not handle non-existing commits

Reviewed-by: rwestberg

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[edvbld]

/integrate

[openjdk]

@edvbld Pushed as commit b2b5358.

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