Check_MK Werk 5240: agent_netapp, environmental sensors monitoring. No longer fails if a node has no configured shelfes

ID: 5240 Title: agent_netapp, environmental sensors monitoring. No longer fails if a node has no configured shelfes Component: Checks & agents Level: 1 Class: Bug fix Version: 1.5.0i1 This fixes the error message <tt>"NoneType" object has no attribute 'children_get'</tt>, reported by the check <tt>NetApp filer connection</tt>.