Check_MK Werk 2503: diskstat: Only excluding multipath members when infos for multipath devices are available

ID: 2503 Title: diskstat: Only excluding multipath members when infos for multipath devices are available Component: Checks & Agents Level: 1 Class: Bug Fix Version: 1.2.7i3 Werk #1831 made the discovery exclude member disks of multipath devices. Only do this when diskstat has information for the multipath devices. Otherwise there will be no Disk IO information at all for these devices.