Werk #6687: Fixed broken prefered button computation

Component	User interface
Title	Fixed broken prefered button computation
Date	Nov 19, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The computation of the prefered buttons within views did not work.

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