refactor(readify) add funcEmpty

lib/server/readify.js

@@ -11,6 +11,8 @@
         tryRequire          = require(DIR_SERVER    + 'tryRequire'),
         nicki               = tryRequire('nicki', {callback: true}),
         
+        funcEmpty           = function() {},
+        
         WIN                 = process.platform === 'win32';
     
     module.exports = function(path, callback) {
@@ -54,7 +56,7 @@
             callback(null, data || {
                 'mode'          : 0,
                 'size'          : 0,
-                'isDirectory'   : function() {}
+                'isDirectory'   : funcEmpty
             });
         });
     }