[Merge] lp:~azzar1/update-manager/fix-lp-1805118 into lp:update-manager

[Andrea Azzarone]

Andrea Azzarone has proposed merging lp:~azzar1/update-manager/fix-lp-1805118 into lp:update-manager.

Commit message:
self.button_settings can be None in case update-manager is running in a distribution that does not ship software-properties-gtk. Do not show the canonical-livepatch reminder if self.button_settings is None.

Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1805118 in update-manager (Ubuntu): "/usr/bin/update-manager:AttributeError:<lambda>:on_livepatch_status_ready"
  https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1805118

For more details, see:
https://code.launchpad.net/~azzar1/update-manager/fix-lp-1805118/+merge/359621
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of lp:~azzar1/update-manager/fix-lp-1805118 into lp:update-manager.
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