No completion file on mesh install

src/freedombone-app-tox

 }
 
 function configure_firewall_for_tox {
-	if grep -Fxq "configure_firewall_for_tox" $COMPLETION_FILE; then
-		return
+	if [ -f $COMPLETION_FILE ]; then
+		if grep -Fxq "configure_firewall_for_tox" $COMPLETION_FILE; then
+			return
+		fi
 	fi
 	if [[ $INSTALLED_WITHIN_DOCKER == "yes" ]]; then
 		# docker does its own firewalling
 	save_firewall_settings
 
 	OPEN_PORTS+=("Tox      $TOX_PORT")
-	echo 'configure_firewall_for_tox' >> $COMPLETION_FILE
+	if [ -f $COMPLETION_FILE ]; then
+		echo 'configure_firewall_for_tox' >> $COMPLETION_FILE
+	fi
 }
 
 function tox_avahi {