Werk #3038: Fixed invalid error message when creating service group assignment rule without having service groups

Component	Setup
Title	Fixed invalid error message when creating service group assignment rule without having service groups
Date	Jan 29, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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