Rewrite words and groups into result

src/app.rs

@@ -94,9 +94,9 @@ pub fn fill_state(state: &mut AppState) {
     let groups = load_word_groups(&state.connection);
     let setting = load_settings(&state.connection);
 
-    state.dictionary = list;
+    state.dictionary = list.unwrap_or_default();
     state.decks = sets.unwrap_or_default();
-    state.word_groups = groups;
+    state.word_groups = groups.unwrap_or_default();
     state.sync_data = setting
 }