Fix when undefined in hostvars
Resolves error when hostvars contain a reference to an undefined variable.
Also, refactors to improve readability.
Dnes úterý 7.5.2024 v 17:00 - 17:15 je plánován security upgrade Gitlabu. Očekáváme nedostupnost služby v rozsahu 15 - 30 minut. Děkujeme za pochopení. / Gitlab security upgrade is planned for Tuesday 07.05.2024 17:00 - 17:15. We are expecting service unavailability 15 - 30 minutes long. Thank you for your understanding.
Resolves error when hostvars contain a reference to an undefined variable.
Also, refactors to improve readability.