[MERGE][1.13] Fix bug when pushing stackable branch in unstackable repo to default-stacking target.

[John Arbash Meinel]

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Andrew Bennetts wrote:
> I'm not sure if this is a regression or not, but the fix is very simple so it
> would be nice to have in 1.13.
> 
> If you have a stackable-format branch in an unstackable repo (e.g.
> BzrBranchFormat7 in RepositoryFormatKnitPack1), and push it to a location with a
> default stacking policy, it will fail with:
> 
>     bzr: ERROR: The repository ... is not a stackable format. You will need to
>     upgrade the repository to permit branch stacking.
> 
> This patch fixes that.
> 
> -Andrew.
> 
> 

BB:approve

John
=:->

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