Merge pull request #455 from Vitaha/master

Fix using closed _writeStream when error is occurred (#357)

Author: kornelski

lib/file.js

@@ -56,6 +56,11 @@ File.prototype.write = function(buffer, cb) {
   if (self.hash) {
     self.hash.update(buffer);
   }
+
+  if (this._writeStream.closed) {
+    return cb();
+  }
+
   this._writeStream.write(buffer, function() {
     self.lastModifiedDate = new Date();
     self.size += buffer.length;