Operater ".?" is counted incorrectly

`
if (valueTable==null || valueTable.Rows==null)
{
               //
}
`
and 
`
if (valueTable?.Rows==null)
{
               //
}
`
should have same complexity value, because they are logically identical and they both have 2 decision points.

But currently if (valueTable?.Rows==null) is counted as 1 decision point.

