Return new line by grep if not match found

Question

I would like to modify this code to return an empty line if no match is found by grep:

while read vl ; do grep "^$vl" Table_S4.tab ; done < 1

Answer 1

while read vl; do
    grep "^$vl" Table_S4.tab || printf "\n"
done < 1

If grep doesn't find a match, the printf command will be run and output an empty line.