[fix] Error with new AV.Role().

Author: leeyeh

lib/role.js

@@ -30,6 +30,8 @@ module.exports = function(AV) {
       if (_.isString(name)) {
         AV.Object.prototype.constructor.call(this, null, null);
         this.setName(name);
+      } else {
+        AV.Object.prototype.constructor.call(this, name, acl);
       }
       if (acl === undefined) {
         var defaultAcl = new AV.ACL();

test/role.js

@@ -20,5 +20,10 @@ describe("Role", function() {
         new AV.Role('foo', {});
       }).to.throwError();
     });
+    it('no argument', function() {
+      expect(function() {
+        new AV.Role();
+      }).not.to.throwError();
+    });
   });
 });