Werk #14530: Fix crash in license graphs for Citrix devices

Component	User interface
Title	Fix crash in license graphs for Citrix devices
Date	Aug 10, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0p28 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This werk fixes a crash in the license graph for some devices (including Citrix devices).

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