[MERGE] Allow reference_revision to be None in the xml7 serializer.

[Aaron Bentley]

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Jelmer Vernooij wrote:
> Am Dienstag, den 08.07.2008, 07:25 -0400 schrieb Aaron Bentley:
>> Aaron Bentley has voted reject.
>> Status is now: Vetoed
>> Comment:
>> I don't think it ever makes sense for the reference revision to be None, 
>> even for working trees.
> Does this mean a a TreeReference always has to refer to a particular
> revision in the inner branch? Or should a wildcard be indicated some
> other way?

It should always refer to a particular revision.

Aaron
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