Check_MK Werk 3574: Fixed broken aggregations snapin when using aggregations based on hard states

ID: 3574 Title: Fixed broken aggregations snapin when using aggregations based on hard states Component: BI Level: 1 Class: Bug Fix Version: 1.2.9i1 When creating an aggregation which bases it's state computation on hard states, this lead to an exception in the sidebar snapin "classobj" not iterable.