show empty svg if there is no data

[zc] / last-heartbeat.sh

#!/bin/sh -e

ls -d queue/*/$( date +%Y-%m-%d ) | while read path ; do
        last=$( ls -t $path | head -1 )
        if [ ! -z "$1" ] ; then
                imei=$( echo $path | cut -d/ -f2 )
                echo -n "$path/$last "
                grep $imei subvision-numbers.txt
        else
                echo "$path/$last"
        fi
done