Remoe warning from filter column operator

[ziv17]

There are two query filter settings that get warning due to using a method that is not known.
file: anyway/widgets/road_segment_widgets/top_road_segments_accidents_per_km_widget.py
method: get_top_road_segments_accidents_per_km

                .filter(AccidentMarkerView.road_segment_name.isnot(None))
                .filter(
                    AccidentMarkerView.accident_severity.in_(
                        [AccidentSeverity.FATAL.value, AccidentSeverity.SEVERE.value]
                    )
                )

[ziv17]

The implementation is completely OK. It follows the documentation. The only issue is that the type checker does not recognize the operators.