all.sh --keep-going: work if TERM is unset
@@ -328,7 +328,7 @@ if [ $KEEP_GOING -eq 1 ]; then
start_red=
end_color=
if [ -t 1 ]; then
- case "$TERM" in
+ case "${TERM:-}" in
*color*|cygwin|linux|rxvt*|screen|[Eex]term*)
start_red=$(printf '\033[31m')
end_color=$(printf '\033[0m')
