Send Content-Disposition header without filename too

Some servers, e.g. Jetty save multipart parts with filename present
in content disposition header to disk.  To prevent this we want
to be able to send Content-Disposition header with name only
(so we can easily access it) but not store bytes to disk to prevent
unwanted IO.

Author: Petri Louhelainen

src/main/java/com/ning/http/multipart/FilePart.java

@@ -147,8 +147,8 @@ public FilePart(String name, String fileName, File file, String contentType, Str
      */
     protected void sendDispositionHeader(OutputStream out) throws IOException {
         String filename = this.source.getFileName();
+        super.sendDispositionHeader(out);
         if (filename != null) {
-            super.sendDispositionHeader(out);
             out.write(FILE_NAME_BYTES);
             out.write(QUOTE_BYTES);
             out.write(MultipartEncodingUtil.getAsciiBytes(filename));