Open vimdiff only if required

upgradeNextcloud.sh

@@ -96,4 +96,7 @@ then
 fi
 sudo -u www-data php /var/www/nextcloud/occ app:update --all
 echo "Please check difference between old and new .htaccess file"
+if [ ! -z "$(diff $NEXTCLOUD_INSTALL_DIR{,.bak}/.htaccess)" ]
+then
     vimdiff $NEXTCLOUD_INSTALL_DIR{,.bak}/.htaccess
+fi