[MERGE][bug #259855] Handle when Transport.stat() returns empty permissions

[John Arbash Meinel]

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At the moment the FTP Transport doesn't check permission bits, but it *does*
implement .stat(). The existing code tried to do a stat() and if it raised
NotImplemented it fell back to *not* setting permission bits. Since FTP now
implements stat() it causes bzr to fall back to the 0700 mode (we force user
rwx because we assume that is always required.)

Anyway, this patch just notices when the stat returns 0000 for permissions and
treats it as a stat failure.

John
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