[Merge] ~dbungert/update-notifier:lp-1926298 into update-notifier:master

[Dan Bungert]

Dan Bungert has proposed merging ~dbungert/update-notifier:lp-1926298 into update-notifier:master.

Commit message:
Fix path lookup segfault

Address segfault regression in the 3.192.40 update (LP: #1926298)
related to hook command path lookup.


Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)
Related bugs:
  Bug #1926298 in update-notifier (Ubuntu): "Segfault added in the recent changes"
  https://bugs.launchpad.net/ubuntu/+source/update-notifier/+bug/1926298

For more details, see:
https://code.launchpad.net/~dbungert/update-notifier/+git/update-notifier/+merge/401901
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~dbungert/update-notifier:lp-1926298 into update-notifier:master.
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