Fix log_loop emitting an empty line on zero output

codearchiver-bot

@@ -27,8 +27,8 @@ function log {
 
 function log_loop {
 	prefix="$1"
-	# If the output does not end with a LF, add one. Then replace CRLF with LF and replace remaining CR with LF.
-	{ lastchar="$(tee /dev/fd/42 | tail -c 1 | xxd -p)"; if [[ "${lastchar}" != '0a' ]]; then printf '\n'; fi } 42>&1 |
+	# If there is output and it does not end with a LF, add one. Then replace CRLF with LF and replace remaining CR with LF.
+	{ lastchar="$(tee /dev/fd/42 | tail -c 1 | xxd -p)"; if [[ "${lastchar}" && "${lastchar}" != '0a' ]]; then printf '\n'; fi } 42>&1 |
 	  sed -u 's,\r$,,; s,\r,\n,g' |
 	  while IFS= read -r line; do log "${prefix}${line}"; done
 }