compare: workaround unexpected Mercurial behaviour when finding ancestor of null rev...

compare: workaround unexpected Mercurial behaviour when finding ancestor of null rev ancestor(id(0000000000000000000000000000000000000000),7) == 7 - that caused weird pull request diffs and lots of grief when (accidentally) creating a pull request from the null revision. Add special handling for the case of null revisions.

Henrik Stuart - - Load All Authors

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