Werk #1620: Fixed exception during host renaming when host has no perfdata

Component	Setup
Title	Fixed exception during host renaming when host has no perfdata
Date	Dec 4, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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