Werk #1004: Fix exception when saving rules, caused by empty item

Component	Setup
Title	Fix exception when saving rules, caused by empty item
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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