Werk #1794: Fix exception in WATO service list in case of vanished checks

Component	Setup
Title	Fix exception in WATO service list in case of vanished checks
Date	Dec 19, 2014
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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