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In grub 2.02, the flag of MULTIBOOT_INFO_HAS_CMDLINE is set even there is no cmdline was configured. So we need to validate the content of cmdline in multiboot info. If there is no cmdline exist, we should not do merge cmdline for SOS VM. Tracked-On: #3214 Signed-off-by: Victor Sun <victor.sun@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>