[Merge] ~nteodosio/update-manager:main into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:main into update-manager:main.

Requested reviews:
  Sebastien Bacher (seb128)

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/457141

Do not crash when updating Update Manager from inside itself.

Please refer to LP:2045918 for full context and test case.
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