When logging to subunit sometimes excepts out with "NoneType does not support buffer interface".

Bug #1517289 reported by Christopher Lee
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Autopilot
Confirmed
Critical
Unassigned

Bug Description

Only when logging stream details does this happen. It happens when an empty file is attempted to be logged.

We see this happen during the Ubuntu UI Toolkit autopilot test runs.

This happens in the depths of testtools, it appears to be resolved in a more recent version, as per these 2 lines:
https://github.com/testing-cabal/testtools/blob/master/testtools/testresult/real.py#L1380

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