Merge pull request #181 in ZP/z-push from feature/ZP-844-support-out-of-office-start-and-end to develop

* commit '0738cae2':
  ZP-844 Fix warnings when PR_EC_OUTOFOFFICE_FROM and PR_EC_OUTOFOFFICE_UNTIL are not set. Rename settingsOOFSEt to settingsOofSet and settingsOOFGEt to settingsOofGet.