[Merge] lp:~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/handle-invalid-removed-file into lp:ubuntu/ubuntu-core-upgrader

[Michael Vogt]

Thanks for adding the test. It runs fine. 

One thing that is a odd is that if I revert the change in r23 (the bugfix for the empty file) and run the tests they still succeed. Is this intended?
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https://code.launchpad.net/~jamesodhunt/ubuntu/vivid/ubuntu-core-upgrader/handle-invalid-removed-file/+merge/254372
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