If Column B Is Blank Delete Entire Row

I am using the following macro to delete "completely empty" rows. I also need to delete some rows if a cell in column B has no value. How would I change this macro?
' DeleteBlankRows

Dim r As Long
Dim C As Range
Dim Rng As Range

On Error GoTo EndMacro
Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual

If Selection.Rows.Count > 1 Then
Set Rng = Selection
Else
Set Rng = ActiveSheet.UsedRange.Rows
End If
For r = Rng.Rows.Count To 1 Step -1
If Application.WorksheetFunction.CountA(Rng.Rows(r).EntireRow) = 0 Then
ActiveSheet.Rows(r).EntireRow.Delete
End If
Next r

EndMacro: