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Do you mean a literal newline character, or the two characters \n?


If the former, try:
awk NF oldfile > new file

--
How big are the files?

Provided your system (which you fail to mention, btw) has the stat command available, try[ $(stat -c%s "$file") = 1 ] && >"$file"

#!/bin/bash
file="file.log"
if ! grep -q "[[:print:]]" $file; then
>$file
fi