Werk #10616: Fix missing contact group conversion

Component	Setup
Title	Fix missing contact group conversion
Date	Nov 28, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The format of the configuration of the contact groups has changed. However, a conversion from the old to the new format was missing in the Hosts and Folders handling, leading to unhandled exceptions in the GUI.

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