Not accounting for UFID value being null

[IJabz]

java.lang.NullPointerException
at java.lang.String.<init>(String.java:554)
at org.jaudiotagger.tag.id3.AbstractID3v2Tag.doGetValues(AbstractID3v2Tag.java:2410)
at org.jaudiotagger.tag.id3.AbstractID3v2Tag.getAll(AbstractID3v2Tag.java:1834)
at org.jaudiotagger.tag.id3.ID3v23Tag.getAll(ID3v23Tag.java:1235)
at com.jthink.songkong.db.SongCache.loadSongFromFile(SongCache.java:99)
at com.jthink.songkong.db.SongCache.addSongToDatabase(SongCache.java:227)
at com.jthink.songkong.analyse.duplicates.DeleteDuplicatesLoadFolderWorker.loadFiles(DeleteDuplicatesLoadFolderWorker.java:147)
at com.jthink.songkong.analyse.duplicates.DeleteDuplicatesLoadFolderWorker.call(DeleteDuplicatesLoadFolderWorker.java:77)
at com.jthink.songkong.analyse.duplicates.DeleteDuplicatesLoadFolderWorker.call(DeleteDuplicatesLoadFolderWorker.java:18)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

[IJabz]

Fixed (plus a couple of similar null checks)