Check_MK Werk 0402: Fix exception in case of missing agent sections of cluster-aware checks

ID: 0402 Title: Fix exception in case of missing agent sections of cluster-aware checks Component: Core & Setup Level: 1 Class: Bug Fix Version: 1.2.5i1 If you configure (by mistake) an <tt>ps</tt> check on an SNMP device - which obviously does not have that agent information - Check_MK would crash with an exception. This has been fixed.