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

[Marius Kruger]

2008/12/1 Aaron Bentley <aaron at aaronbentley.com>

> Aaron Bentley has voted resubmit.
> Status is now: Resubmit
> Comment:
> It doesn't make sense to use NULL_REVISION when the revno is not supplied.
>  That is a specific revision-- it doesn't mean "unspecified".

I'm sorry about that, while trying to figure out whats wrong I got a
deprecation warning,
since some code down the line used the null revid. Now that we give the
proper exception I don't see that warning any more.

updated patch attached.

thanks a lot for looking at this
marius
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