InternalVersionManagerBase.calculateCheckinVersionName will fail with NPE upon empty predecessors property
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                 Key: JCR-3286
                 URL: https://issues.apache.org/jira/browse/JCR-3286
             Project: Jackrabbit Content Repository
          Issue Type: Improvement
          Components: jackrabbit-core, versioning
    Affects Versions: 2.4, 2.2.11, 2.6
            Reporter: Julian Reschke
            Assignee: Julian Reschke
            Priority: Trivial
             Fix For: 2.2.12, 2.4.2, 2.6


(Note: this can only happen on inconsistent version storage)

We should add a check here, and throw a more descriptive exception.

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