Checkmk Werk 15019: Fix proxmox agent crash with shutdown nodes

ID: 15019 Title: Fix proxmox agent crash with shutdown nodes Component: Checks & agents Level: 1 Class: Bug fix Version: 2.2.0i1 The proxmox agent would fail with a KeyError when a proxmox VE node was shutdown. The error occured because a we do not get information for the timezone of shutdown nodes. The timezone information is used to convert timestamps for backups to utc. When no timezone information is found for a node we use the timezone of the first node we process.