qt4: playlist_model, set current to NULL if currentitem is removed or input changed to NULL

modules/gui/qt4/components/playlist/playlist_model.cpp

@@ -282,6 +282,7 @@ bool PLModel::dropMimeData( const QMimeData *data, Qt::DropAction action,
 void PLModel::removeItem( int i_id )
 {
     PLItem *item = FindById( rootItem, i_id );
+    if( currentItem && currentItem->p_input == item->p_input ) currentItem = NULL;
     if( item ) item->remove( item );
 }
 
@@ -663,6 +664,10 @@ void PLModel::ProcessInputItemUpdate( input_thread_t *p_input )
         currentItem = item;
         emit currentChanged( index( item, 0 ) );
     }
+    else
+    {
+        currentItem = NULL;
+    }
 }
 void PLModel::ProcessInputItemUpdate( input_item_t *p_item )
 {