Fix crash on empty savefile

src/ui.rs

@@ -48,8 +48,12 @@ fn draw_seeding_tab(f: &mut Frame, app: &mut App) {
     f.render_stateful_widget(
         list,
         chunks[0],
-        &mut ListState::default()
+        &mut ListState::default().with_selected(
-            .with_selected(Some(app.included_publications.len() - 1)),
+            match app.included_publications.len() {
+                0 => None,
+                _ => Some(app.included_publications.len() - 1),
+            },
+        ),
     );
 
     // Text entry