[Merge][#301969]Give proper error message for diff with non-existent dotted revno

[Marius Kruger]

2008/11/30 Marius Kruger <amanic at gmail.com>

> hi all,
> I added some tests for `bzr diff -r 1.1` and `bzr diff -c 1.1` where revno
> 1.1 does not exist,
> This patch gives a consistent error message as a non-dotted revno eg. `bzr
> diff -r 1234`.
> It passes all tests, but I'm not sure if something else relied on getting
> back (branch, None, None)
> for non-existing dotted revnos.

added news.

>
>
> regards
> marius
>
>
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