Create empty manifest when we have no files

Author: moonglum

lib/build-manifest-writer.js

@@ -13,10 +13,6 @@ module.exports = manifestConfig => {
 	let manifest = {};
 	return results => {
 		let filteredResults = results.filter(result => result.changed);
-		if(filteredResults.length === 0) {
-			return results;
-		}
-
 		manifest = updateManifest(filteredResults, manifest, manifestConfig);
 		return writeManifest(filteredResults, manifest, manifestConfig);
 	};