Better code for no-files case and result initializaion

lib/config-builder.js

@@ -32,7 +32,6 @@ exports.produceConfigObject = function (root, callback) {
             dirExists[path.basename(dirs[i])] = true;
         }
 
-        var result;
         var files = Object.keys(filesAndDirs.files);
         var firstPass = [], secondPass = [];
         for (var i = 0; i < files.length; i++) {
@@ -51,15 +50,15 @@ exports.produceConfigObject = function (root, callback) {
             }
         }
         var bothPasses = [].concat(firstPass).concat(secondPass);
+        if (!bothPasses.length) {
+            callback(new Error("No .amd.json-type file found"));
+            return;
+        }
+        var result = {};
         for (var i = 0; i < bothPasses.length; i++) {
             var file = bothPasses[i];
-            result = result || {};
             _.merge(result, require(file));
         }
-        if (!result) {
-            callback(new Error("local.amd.json not found"));
-        } else {
-            callback(null, result);
-        }
+        callback(null, result);
     })
 };