implement Comment in SSR compiler – fixes #165

src/server-side-rendering/compile.js

@@ -113,6 +113,10 @@ export default function compile ( parsed, source, { filename }) {
 	let elementDepth = 0;
 
 	const stringifiers = {
+		Comment () {
+			return '';
+		},
+
 		Component ( node ) {
 			const props = node.attributes.map( attribute => {
 				let value;

test/server-side-rendering/comment/_actual.html

@@ -0,0 +1,3 @@
+<p>before</p>
+	 
+	 <p>after</p>

test/server-side-rendering/comment/_expected.html

@@ -0,0 +1,2 @@
+<p>before</p>
+<p>after</p>

test/server-side-rendering/comment/main.html

@@ -0,0 +1,3 @@
+<p>before</p>
+<!-- a comment -->
+<p>after</p>