fix(lsinitrd.sh): always check that MACHINE_ID is not empty

Author: aafeijoo-suse

Diff for: lsinitrd.sh

@@ -133,9 +133,11 @@ else
         image="/lib/modules/${KERNEL_VERSION}/initrd"
     elif [[ -f /boot/initramfs-${KERNEL_VERSION}.img ]]; then
         image="/boot/initramfs-${KERNEL_VERSION}.img"
-    elif mountpoint -q /efi; then
+    elif [[ $MACHINE_ID ]] \
+        && mountpoint -q /efi; then
         image="/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
-    elif mountpoint -q /boot/efi; then
+    elif [[ $MACHINE_ID ]] \
+        && mountpoint -q /boot/efi; then
         image="/boot/efi/${MACHINE_ID}/${KERNEL_VERSION}/initrd"
     else
         image=""