# test if files exists and run
if [ "$(ls -A ${base_dir}/schedule)" ]; then
     ls -A ${base_dir}/schedule | parallel -j20 ./warc.sh {/}\; rm {}
fi

Output:
   Cannot be run without input...
   File does not exist, terminating....

./warc.sh: line 52: declare: `7616-8975-DATA.NFO': not a valid identifier
rm: cannot remove ‘7616-8975-data.nfo’: No such file or directory