Added error() method to DownloadListener interface.

Downloads failing due to connection errors will now send a bar notification instead of throwing an ErrorHandler dialog.

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/downloads/DownloadNode.java

@@ -225,6 +225,11 @@ public class DownloadNode {
 				public void completed() {
 					UI.sendBarNotification(String.format("Download complete: %s", getTitle()));
 				}
+
+				@Override
+				public void error() {
+					UI.sendBarNotification("Download failed due to a connection error.");
+				}
 			});
 		}
 	}