Zabbix

..F....... [ZBX-27031] fixed host navigator to load when show problems is set to None

* commit '76416310879492cd18d74b765e421d8867aba1c4':
  .......... [ZBX-27031] uncomment tests after bug fix
  ..F....... [ZBX-27031] fixed coding style by explicitly showing that property might not be present (Part 2)
  ..F....... [ZBX-27031] fixed coding style by explicitly showing that property might not be present
  .D........ [ZBX-27031] updated ChangeLog entry
  ..F....... [ZBX-27031] fixed host navigator to load when show problems is set to None

(cherry picked from commit 67b2373af48d9d8e583d304badde6f605c467b71)
(cherry picked from commit 287517b6ce45f65dd3d7585e14dcf9863aef56be)