Fix crash bug

app/src/leanback/java/com/fongmi/android/tv/ui/activity/CollectActivity.java

@@ -98,7 +98,6 @@ public class CollectActivity extends BaseActivity {
     private void setViewModel() {
         mViewModel = new ViewModelProvider(this).get(SiteViewModel.class);
         mViewModel.result.observe(this, result -> {
-            if (mExecutor == null) return;
             mAdapter.add(Collect.create(result.getList()));
             getFragment().addVideo(result.getList());
             mPageAdapter.notifyDataSetChanged();

app/src/leanback/java/com/fongmi/android/tv/ui/fragment/CollectFragment.java

@@ -72,7 +72,7 @@ public class CollectFragment extends BaseFragment implements VodPresenter.OnClic
     }
 
     public void addVideo(List<Vod> items) {
-        if (checkLastSize(items)) return;
+        if (checkLastSize(items) || getActivity() == null || getActivity().isFinishing()) return;
         List<ListRow> rows = new ArrayList<>();
         for (List<Vod> part : Lists.partition(items, Prefers.getColumn())) {
             mLast = new ArrayObjectAdapter(new VodPresenter(this));