connection errors are not caught

[Robert Collins]

 affects pqm
 status triaged
 importance critical
 done

This is a routine error, not an exceptional one to tell the admins
about:
Permission denied (publickey).

Traceback (most recent call last):
  File "/home/pqm/pqm/bin/pqm", line 245, in <module>
...
bzrlib.errors.ConnectionReset: Connection closed: Unexpected end of
message. Please check connectivity and permissions, and report a bug if
problems persist.

[Robert Collins (lifeless)]

Bah, I trimmed too much. Will need to capture the full log.

Possibly this is a bzr bug (that it should be raising an informative NotBranchError) or a definitional problem in the interface for opening branches.