fix(music): hide album art widget when no image

src/modules/music/mod.rs

@@ -410,9 +410,11 @@ impl Module<Button> for MusicModule {
                             let res = if let Some(image) = new_cover.and_then(|cover_path| {
                                 ImageProvider::parse(&cover_path, &icon_theme, false, image_size)
                             }) {
+                                album_image.show();
                                 image.load_into_image(album_image.clone())
                             } else {
                                 album_image.set_from_pixbuf(None);
+                                album_image.hide();
                                 Ok(())
                             };