[MERGE][RFC] Support *no authors* for a commit

[Jelmer Vernooij]

Subversion and cvs2svn will occasionally create commits that have no
committer or author set (e.g. commits not made by humans but "padding"
commits).  bzr-svn will in this situation happily set the committer
field to None and Bazaar deals with this just fine. However, the new
Revision.get_apparent_authors() function will in this situation return
[None].

Despite the fact that it's not generally a good idea to have the
committer field set to None (robots have identities, too!) I think it
should return [] rather than [None] so e.g. GUIs or bzr log don't show
an empty author field or traceback.

Cheers,

Jelmer

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