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* Fix reading /etc/machine-id in kernel-install The kernel-install script has code to read the contents of /etc/machine-id into the MACHINE_ID variable. Depending on the variable content kernel-install either logs the value or creates a new machine id via 'systemd-id128 new'. In that logic there is one issue. If the file /etc/machine-id exists but is empty, the script tries to call read on an empty file which return with an exit code != 0. As the script code also uses 'set -e', kernel-install will exit at this point which is unexpected. The condition of an empty /etc/machine-id file exists for example when building OS images, which should initialize the system id on first boot but not staticly inside of the image. afaik an empty /etc/machine-id is also a common approach to make systemd indicate that it should create a new system id. Because of this, the commit makes sure the reading of /etc/machine-id does not fail in any case such that the handling of the MACHINE_ID variable takes place.