selftest broken when Paramiko absent

[Aaron Bentley]

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In the latest bzr, selftest does not run if sftp can't be loaded.  I'm
having trouble pinpointing the precise problem, because I'm running on
Windows, and I don't know where .bzr.log is.

I assume this has something to do with test-providers.

C:\bzr.ttransform\bzrlib\transport\ftp.py:311: UserWarning: There are no
FTP transport provider tests yet.
~  warn("There are no FTP transport provider tests yet.")
C:\bzr.ttransform\bzrlib\transport\http.py:434: UserWarning: There are
no HTTPS
transport provider tests yet.
~  warn("There are no HTTPS transport provider tests yet.")
bzr: ERROR: The SFTP transport requires paramiko.
bzr: ERROR: exceptions.ImportError: No module named paramiko
~  at C:\bzr.ttransform\bzrlib\transport\sftp.py line 45
~  in ?

Aaron
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