[Merge] lp:~takluyver/unattended-upgrades/apt-lock-crash into lp:~ubuntu-core-dev/unattended-upgrades/ubuntu

[Thomas Kluyver]

Thomas Kluyver has proposed merging lp:~takluyver/unattended-upgrades/apt-lock-crash into lp:~ubuntu-core-dev/unattended-upgrades/ubuntu.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~takluyver/unattended-upgrades/apt-lock-crash/+merge/133482

I ran into a bytes/unicode crash on Quantal, and while fixing it, I noticed that a variable could end up undefined.

I can't get it to go into that code path now, but this change should fix things if it does end up there.
-- 
https://code.launchpad.net/~takluyver/unattended-upgrades/apt-lock-crash/+merge/133482
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~takluyver/unattended-upgrades/apt-lock-crash into lp:~ubuntu-core-dev/unattended-upgrades/ubuntu.
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