How to use the GetViewLine when the line is blank?

Hi,

I used the "IEditorViewLine GetViewLine(double verticalLocation, LocationToPositionAlgorithm algorithm)" method to get the view line, but if the line is blank, it will return null, like this:

1 | xxxxx
2 | xxxxx
3 |
4 | xxxxx

I cannot get the third line through this method, how to get it?

Thanks a lot!