less error outpouts if no appointment

.local/bin/statusbar/appointments

@@ -2,6 +2,7 @@
 #Print the next appointment for the day for statusbar
 #or generate notification for upcoming appointment
 diff=$(calcurse --next | tail -n1 | sed 's/^\s*//; s/\[//;s/\]//' | cut -f1 -d ' ')
+if [ -n "$diff" ]; then
 	secs=$(( $(echo "$diff" | cut -f1 -d ':') * 3600  + $(echo "$diff" | cut -f2 -d ':') *60 ))
 	time_appointment="$(date --date "@$(( $( date +'%s' ) + $secs ))" +"%s")"
 	appointment="$(calcurse --next | tail -n1 | awk '{$1=""; print $0}' | sed 's/^\s*//')"
@@ -13,5 +14,7 @@ else
 		if [ $midnight -gt "$time_appointment" ]; then
 			printf '%s %s' "$(date --date "@$time_appointment" +'%H:%M')" "$appointment"
 		fi
+	fi
+else
 	printf '\n'
 fi