Werk #8851: Fix broken "Parameters of X" for clustered services

Component	Setup
Title	Fix broken "Parameters of X" for clustered services
Date	Aug 13, 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) 1.6.0b6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The "Parameters of X" page always showed an exception like "'list' object has no attribute 'check_plugin_name'".

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