some changes

app/src/main/java/app/fedilab/android/BaseMainActivity.java

@@ -243,9 +243,6 @@ public abstract class BaseMainActivity extends BaseActivity implements NetworkSt
             if (b != null) {
                 if (b.getBoolean(Helper.RECEIVE_REDRAW_TOPBAR, false)) {
                     List<MastodonList> mastodonLists = (List<MastodonList>) b.getSerializable(Helper.RECEIVE_MASTODON_LIST);
-                    if (mastodonLists != null && mastodonLists.size() == 0) {
-                        mastodonLists = null;
-                    }
                     redrawPinned(mastodonLists);
                 }
                 if (b.getBoolean(Helper.RECEIVE_REDRAW_BOTTOM, false)) {
@@ -1227,12 +1224,8 @@ public abstract class BaseMainActivity extends BaseActivity implements NetworkSt
                             PinnedTimelineHelper.redrawTopBarPinned(BaseMainActivity.this, binding, pinned, bottomMenu, null);
                             //Fetch remote lists for the authenticated account and update them
                             new ViewModelProvider(BaseMainActivity.this).get(TimelinesVM.class).getLists(currentInstance, currentToken)
-                                    .observe(this, mastodonLists -> {
-                                        if (mastodonLists != null && mastodonLists.size() == 0) {
-                                            mastodonLists = null;
-                                        }
-                                                PinnedTimelineHelper.redrawTopBarPinned(BaseMainActivity.this, binding, pinned, bottomMenu, mastodonLists);
-                                            }
+                                    .observe(this, mastodonLists ->
+                                            PinnedTimelineHelper.redrawTopBarPinned(BaseMainActivity.this, binding, pinned, bottomMenu, mastodonLists)
                                     );
                         });
 

app/src/main/java/app/fedilab/android/mastodon/viewmodel/mastodon/TimelinesVM.java

@@ -679,13 +679,14 @@ public class TimelinesVM extends AndroidViewModel {
     public LiveData<List<MastodonList>> getLists(@NonNull String instance, String token) {
         mastodonListListMutableLiveData = new MutableLiveData<>();
         MastodonTimelinesService mastodonTimelinesService = init(instance);
-        List<MastodonList> mastodonListList = new ArrayList<>();
         new Thread(() -> {
+            List<MastodonList> mastodonListList = null;
             Call<List<MastodonList>> getListsCall = mastodonTimelinesService.getLists(token);
             if (getListsCall != null) {
                 try {
                     Response<List<MastodonList>> getListsResponse = getListsCall.execute();
                     if (getListsResponse.isSuccessful()) {
+                        mastodonListList = new ArrayList<>();
                         List<MastodonList> mastodonLists = getListsResponse.body();
                         if (mastodonLists != null) {
                             mastodonListList.addAll(mastodonLists);
@@ -696,7 +697,8 @@ public class TimelinesVM extends AndroidViewModel {
                 }
             }
             Handler mainHandler = new Handler(Looper.getMainLooper());
-            Runnable myRunnable = () -> mastodonListListMutableLiveData.setValue(mastodonListList);
+            List<MastodonList> finalMastodonListList = mastodonListList;
+            Runnable myRunnable = () -> mastodonListListMutableLiveData.setValue(finalMastodonListList);
             mainHandler.post(myRunnable);
         }).start();
         return mastodonListListMutableLiveData;