Werk #3398: Fix exception in Matrix layout if it contains certain complex columns

Component	User interface
Title	Fix exception in Matrix layout if it contains certain complex columns
Date	Apr 14, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8b11 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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