Attempted fix for a null pointer exception in #123.

Signed-off-by: Jeffrey Han <[email protected]>

src/itdelatrisu/opsu/downloads/DownloadNode.java

@@ -248,7 +248,7 @@ public void createDownload(DownloadServer server) {
  return;
  String path = String.format("%s%c%d", Options.getOSZDir(), File.separatorChar, beatmapSetID);
  String rename = String.format("%d %s - %s.osz", beatmapSetID, artist, title);
- this.download = new Download(url, path, rename);
+ Download download = new Download(url, path, rename);
  download.setListener(new DownloadListener() {
  @Override
  public void completed() {
@@ -260,6 +260,7 @@ public void error() {
  UI.sendBarNotification("Download failed due to a connection error.");
  }
  });
+ this.download = download;
  if (Options.useUnicodeMetadata()) // load glyphs
  Utils.loadGlyphs(Utils.FONT_LARGE, getTitle(), null);
  }
@@ -372,6 +373,7 @@ public void drawResult(Graphics g, int index, boolean hover, boolean focus, bool
  * @param hover true if the mouse is hovering over this button
  */
  public void drawDownload(Graphics g, int index, int id, boolean hover) {
+ Download download = this.download; // in case clearDownload() is called asynchronously
  if (download == null) {
  ErrorHandler.error("Trying to draw download information for button without Download object.", null, false);
  return;