skip empty tags

php/servers/servers-rooms.php

@@ -417,6 +417,7 @@
 		public function add_tags(array $tags) {
 			$new_string_tags = [];
 			foreach ($tags as $tag) {
+				if (strlen($tag) == 0) continue;
 				$this->string_tags[] = $tag;
 				if ($this->parse_language_tag($tag)) continue;
 				$new_string_tags[] = $tag;