[MERGE] Clarify tests in revisionstore_implementations/test_all

[Robert Collins]

On Thu, 2007-08-23 at 09:12 +1000, Robert Collins wrote:
> Actually, I've thought about this more, asking for a revision None is
> nuts; giving 'NoSuchRevision' for None, while true, is not really
> helpful - TypeError, which is what the check_revision_id call raises is
> better.
> 
> So I propose to change it to wanting TypeError for None.

Or better yet, I'll look around some more. Heres an incremental patch
that I think gets the balance right.

These tests really were for 'null:'. So I've done that:


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