Don't drop empty tags

Data/template.class.php

@@ -27,7 +27,8 @@
 			'merge-divs'=>false,
 			'merge-spans'=>false,
 			'logical-emphasis'=>false,
-			'literal-attributes'=>true
+			'literal-attributes'=>true,
+			'drop-empty-elements'=>false
 		];
 		private static $regex = [
 			'getmatch'=>'/\{!([^#\/?_][^}\n]*?)\}/i',