removed obsolete test

lib/single-file/single-file-core.js

@@ -368,9 +368,7 @@ const SingleFileCore = (() => {
 			node = commentNodesWalker.nextNode();
 			let removedNodes = [];
 			while (node) {
-				if (node.nodeType == 8) {
-					removedNodes.push(node);
-				}
+				removedNodes.push(node);
 				node = commentNodesWalker.nextNode();
 			}
 			removedNodes.forEach(node => node.remove());