UKIs may be loaded in a way, that there can not be a device handle to the filesystem, that contains the image, for example when using a bootloader to load the image from a partition with a file system that is not supported by the firmware. With the current systemd stub, this causes a failed assertion, because stub gets passed a NULL DeviceHandle and FilePath. Inserting two explicit checks enables proper boot even in this case. Fixes: #29331
System and Service Manager
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