Merge pull request #55 from rwjblue/ensure-empty-files-are-excluded

Exclude empty files from generated asset-manifest.json.

lib/asset-manifest-generator.js

@@ -1,3 +1,5 @@
+'use strict';
+
 var Plugin = require('broccoli-caching-writer');
 var walk = require('walk-sync');
 var path = require('path');
@@ -101,10 +103,17 @@ AssetManifestGenerator.prototype.build = function() {
       var assetType = assetName.split('.').pop();
 
       if (supportedTypes.indexOf(assetType) !== -1) {
-        manifest.bundles[bundleName].assets.push({
-          uri: generateURI(path.join(prepend, entry)),
-          type: assetType
-        });
+
+        // only add non-empty assets
+        let fullPath = path.join(inputPath, entry);
+        let contents = fs.readFileSync(fullPath, 'utf-8');
+
+        if (contents.trim() !== '') {
+          manifest.bundles[bundleName].assets.push({
+            uri: generateURI(path.join(prepend, entry)),
+            type: assetType
+          });
+        }
       }
     }