Checkmk Werk 11389: Fixed error in inventory if block device is virtual

ID: 11389 Title: Fixed error in inventory if block device is virtual Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 If a block device is not a physical one that contains a firmware revision or serial number the inventory plugin failed and showed an error. All information for a block device is now optional.