Merge pull request #2621 from nextcloud/activity-return-null

ui:activity: Removed @NonNull annotation for method where null can be returned

src/main/java/com/owncloud/android/ui/activity/ErrorsWhileCopyingHandlerActivity.java

@@ -151,7 +151,6 @@ public class ErrorsWhileCopyingHandlerActivity  extends AppCompatActivity implem
         /**
          * {@inheritDoc}
          */
-        @NonNull
         @Override
         public View getView (int position, View convertView, @NonNull ViewGroup parent) {
             View view = convertView;