Do not try to dump partition tables for a disk when non are detected

Refs #11293

handlers/sys.in

@@ -609,12 +609,18 @@ fi
 if [ "$partitions" == "yes" ]; then
    if [ "$dosfdisk" == "yes" ]; then
       devices=`LC_ALL=C $LSBLK --output NAME,TYPE --list --paths 2>/dev/null | grep "disk$" | grep -v '^/dev/zram' | @AWK@ '{print $1}'`
+      partitions=`LC_ALL=C $SFDISK -l 2>/dev/null |grep "^/dev" | @AWK@ '{print $1}'`
       if [ "$devices" == "" ]; then
          warning "No harddisks found"
       fi
       for dev in $devices; do
          debug "$SFDISK will try to backup partition tables for device $dev"
          [ -b $dev ] || continue
+         echo "${partitions}" | grep -q "${dev}"
+         if [ $? -ne 0 ] ; then
+             info "The device $dev does not appear to have any partitions"
+             continue
+         fi
          label=${dev#/dev/}
          label=${label//\//-}
          outputfile=${partitionsfile//__star__/$label}