RFC: remove traceback from "newer branch format than your bzr"

[Alexander Belchenko]

Stephen J. Turnbull пишет:
> Martin Pool writes:
> A better strategy is to output
> 
>     AbsentContentFactory has no attribute ...
>     This probably indicates a bug in Bazaar.  Please report this by
>     going to http://bugs.bazaar-vcs.org/ and creating a bug report.
> 
> Then (1) if you have reason to believe that you still have a
> functioning IO system, write the trace to a uniquely-named file and
> output:
> 
>     Please attach the file /tmp/bzr.error.20090811.215559 to the
>     report.  It contains information about the state of bzr at the
>     time of the error that is often useful in debugging bzr.

Indeed, this is the right way. +1