Also, don't panic when both optional arguments are empty. This should make the syntax compatible-ish with the dracut one from dracut.cmdline(7). Resolves: #29855 (cherry picked from commit cc5244716baac64e92a1aac5d118c41ac7f82a00) (cherry picked from commit c3a17ab2fa2eeeab67c3f1085eb9c69630bbd191)
System and Service Manager
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