Fix Minecraft backup script not handling new deployments

roles/minecraft/templates/recover.sh

@@ -13,6 +13,11 @@ set -e
 export MINECRAFT_DIR="/var/minecraft/{{ mcname }}"
 cd "$MINECRAFT_DIR" || exit 50
 
+# Make sure we have a backup
+if ! aws s3 ls "s3://{{ aws_backup_bucket }}/{{ mcname }}/" > /dev/null 2>&1; then
+	echo "No backups available"
+	exit 0
+fi
 # If the world directory exists, we need to ensure that we don't clobber it
 if [ -d "world" ]; then
 	echo "Backing up current world"