set this.hash to null by default

Author: sreuter

lib/file.js

@@ -12,14 +12,13 @@ function File(properties) {
   this.path = null;
   this.name = null;
   this.type = null;
+  this.hash = null;
   this.lastModifiedDate = null;
 
   this._writeStream = null;
 
-  if(typeof properties === 'object') {
-    for (var key in properties) {
-      this[key] = properties[key];
-    }
+  for (var key in properties) {
+    this[key] = properties[key];
   }
 
   if(typeof this.hash === 'string') {