Werk #1005: Fix exception when using pretty-print output format

Component	HW/SW inventory
Title	Fix exception when using pretty-print output format
Date	Jun 27, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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