Make sure dir exists when stat'ing

Otherwise an exception is thrown and things fail on an npm run init

Auditors: @bridiver

lib/util.js

@@ -151,7 +151,7 @@ const util = {
       for (var i in sourceFiles) {
         const sourceFile = sourceFiles[i]
         let destinationFile = output
-        if (fs.statSync(destinationFile).isDirectory()) {
+        if (fs.existsSync(destinationFile) && fs.statSync(destinationFile).isDirectory()) {
           destinationFile = path.join(destinationFile, path.basename(sourceFile))
         }