Werk #13464: citrix_state.controller: Provide info on powered off machine

Component	Checks & agents
Title	citrix_state.controller: Provide info on powered off machine
Date	Apr 14, 2022
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

In case of an empty "controller" field, the message "Machine powered off" is displayed.

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