Temporarily make releasing music player an error notification

To try to establish whether releasing the music player is related to

app/music.py

@@ -44,7 +44,7 @@ class FadeTrack(QRunnable):
             sleep(1 / Config.FADEOUT_STEPS_PER_SECOND)
 
         self.player.stop()
-        log.debug(f"Releasing player {self.player=}")
+        log.error(f"Releasing player {self.player=}")
         self.player.release()
 
 

app/musicmuster.py

@@ -157,7 +157,10 @@ class ImportTrack(QObject):
         super().__init__()
         self.filenames = filenames
         self.source_model = source_model
-        self.next_row_number = row_number
+        if row_number is None:
+            self.next_row_number = source_model.rowCount()
+        else:
+            self.next_row_number = row_number
         self.signals = MusicMusterSignals()
 
     def run(self):