Fix secondary bar launched for empty monitor name

polybar/launch.sh

@@ -23,7 +23,11 @@ echo "Primary monitor: $primary"
 
 echo -e "\nDetermining secondary monitors..."
 secondary="$(xrandr --listmonitors | sed -n "1d;/$primary\$/d;"'s/^.* \([^ ][^ ]*\)$/\1/p')"
+if [[ -n $secondary ]]; then
 	echo "Secondary monitors:"; echo "$secondary" | sed -r 's/^/* /'
+else
+	echo "No secondary monitors."
+fi
 
 
 
@@ -36,7 +40,6 @@ killall -q polybar
 
 # Wait until the processes have been shut down
 while pgrep -u $UID -x polybar >/dev/null; do sleep 1; done
-
 echo "Terminated."
 
 (
@@ -56,9 +59,11 @@ echo "Terminated."
 
 	start_polybar midbard "$primary"
 
+	if [[ -n $secondary ]]; then
 		while read -r monitor; do
 			start_polybar secondary "$monitor"
 		done <<< "$secondary"
+	fi
 )
 
 exec 1>&- 2>&-