RFR: A GitLab merge request source repo may have an ID but still be inaccessible (due to permissions)

[Robin Westberg]

Hi all,

Please review this change that ensures that the source repository of a GitLab merge request is accessible before
attempting to use it.

Best regards,
Robin

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Commit messages:
 - A GitLab merge request source repo may have an ID but still be inaccessible (due to permissions)

Changes: https://git.openjdk.java.net/skara/pull/762/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=762&range=00
  Stats: 29 lines in 3 files changed: 15 ins; 0 del; 14 mod
  Patch: https://git.openjdk.java.net/skara/pull/762.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/762/head:pull/762

PR: https://git.openjdk.java.net/skara/pull/762