fixed mpd nullpointer exceptions

src/de/ctdo/crashtest/mpd/MPDController.java

@@ -48,7 +48,7 @@ public class MPDController implements  IMPDController {
                 @Override
                 public void run() {
                     synchronized (mpd) {
-                        addToPlayListIfNeeded(artist, title);
+
 
                         doPlaySong(artist,title);
                     }
@@ -68,6 +68,8 @@ public class MPDController implements  IMPDController {
             int tries = 3;
 
             while(tries>0) {
+                addToPlayListIfNeeded(artist, title);
+
                 for(MPDSong song: playlist.getSongList()) {
                     if(checkSong(song, artist, title)) {
                         System.out.println("MPD: stopping, playing, go...");
@@ -85,7 +87,7 @@ public class MPDController implements  IMPDController {
                     System.out.println("MPD: song is correctly playing");
                     return;
                 } else {
-                    System.out.println("MPD: wrong track is playing. " + song.getArtist() + " - " + song.getTitle());
+                    System.out.println("MPD: wrong track is playing");
                 }
 
                 System.out.println("MPD: next try");
@@ -102,10 +104,14 @@ public class MPDController implements  IMPDController {
     }
     
     private boolean checkSong(final MPDSong song, final String artist, final String title) {
-        if(song.getArtist() != null && song.getTitle() != null) {
-            if(song.getArtist().getName().toLowerCase().contentEquals(artist.toLowerCase()) &&
-               song.getTitle().toLowerCase().contentEquals(title.toLowerCase())) {
-                return true;
+        if(song != null) {
+            if(song.getArtist() != null && song.getTitle() != null) {
+                if(song.getArtist().getName().toLowerCase().contentEquals(artist.toLowerCase()) &&
+                    song.getTitle().toLowerCase().contentEquals(title.toLowerCase())) {
+                    return true;
+                }
+            } else {
+                System.out.println("MPD: song is nullb");
             }
         } else {
             System.out.println("MPD: track title or artist is null " + artist + " - " + title);