[merge][#321695] fix TypeError branching old repositories

[John Arbash Meinel]

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Martin Pool wrote:
> There's a separate implementation of BzrDir.sprout for old all-in-one
> repositories, and it actually fails with some current calls.  Here's a
> quick fix for it.
> 
> 

BB:approve

Of course, this seems like it should be part of the "per_branch" tests.

John
=:->

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