Werk #3345: Fixed exception when inventory painter was used as group painter

Component	User interface
Title	Fixed exception when inventory painter was used as group painter
Date	Mar 24, 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

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