[Merge] ~nteodosio/update-manager:main-no-attribute into update-manager:main

[Nathan Teodosio]

Nathan Teodosio has proposed merging ~nteodosio/update-manager:main-no-attribute into update-manager:main.

Requested reviews:
  Sebastien Bacher (seb128)
Related bugs:
  Bug #2064211 in update-manager (Ubuntu): "/usr/bin/update-manager:AttributeError:<lambda>:available:start_available:refresh_cache:_get_ua_security_status"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/2064211

For more details, see:
https://code.launchpad.net/~nteodosio/update-manager/+git/update-manager/+merge/466327

Previous fix for LP:2064211 was insufficient, as can be seen by running the test case of the bug, namely UA_CONFIG_FILE=/ update-manager --no-update.
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