lvm-prom-collector: Fix text format error

Author: sr

lvm-prom-collector

@@ -115,6 +115,7 @@ if [ "$thin_pools" = true ] ; then
     declare $line
     # Convert ',' to '.'
     data_percent=$(echo "$LVM2_DATA_PERCENT" | sed 's/\,/./' )
+    [ -z "$data_percent" ] && continue
     echo "node_lvm_thin_pools_allocated{uuid=\"$LVM2_LV_UUID\", vgroup=\"$LVM2_VG_NAME\"} $data_percent"
   done
 fi