fix issue with unsupported file types and suppressed console printing

src/app/musicplayer/MusicPlayer.java

@@ -3,6 +3,8 @@
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.OutputStream;
+import java.io.PrintStream;
 import java.net.URISyntaxException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -81,6 +83,14 @@ public void start(Stage stage) throws Exception {
 
     	// Suppresses warning caused by converting music library data into xml file. 
         LogManager.getLogManager().reset();
+        PrintStream dummyStream = new PrintStream(new OutputStream() {
+            public void write(int b) {
+                //do nothing
+            }
+        });
+        System.setOut(dummyStream);
+        System.setErr(dummyStream);
+
         timer = new Timer();
         timerCounter = 0;
         secondsPlayed = 0;

src/app/musicplayer/util/XMLEditor.java

@@ -178,10 +178,13 @@ private static void musicDirFileFinder(File musicDirectoryFile) {
 	}
 
 	private static void addSongToXML() {
-
 		// Initializes the array list with song objects to add to the xml file.
 		ArrayList<Song> songsToAdd = createNewSongObject();
 
+		if (songsToAdd.size() == 0) {
+			return;
+		}
+
         try {
 			DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
 			DocumentBuilder docBuilder = docFactory.newDocumentBuilder();