stacking on non-stackable formats

[Aaron Bentley]

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Robert Collins wrote:
> Hi Aaron, if I remember correctly you found that stacking had some
> 'issues' during cloning. Perchance did you fix the issue with a
> non-stackable target format being made during 'bzr branch --stacked' and
> 'bzr push --stacked'?

I believe my current code silently falls back to non-stacked if the
target format doesn't support stacking.  Not suggesting this is optimal.

Aaron
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