Toggle Hide Row Based on Column Data

I'm looking to have a macro that will hide all rows where the cell in column B of that row is blank. The formulas in those cells are returning "" if there isn't a calculated value. I'd like that macro to also unhide all rows if there are currently rows hidden in the range. However, I'm having trouble simply getting the rows to hide. I tried the following:

Sub ToggleHide()
    If Range("B:B").Value = "" Then
        Rows("2:200").EntireRow.Hidden = True
    Else: Rows("2:200").EntireRow.Hidden = False
    End If
End Sub

That didn't work, so I thought "" might be returning as Null and tried the following, which also did not work.

Sub ToggleHide()
    If IsNull(Range("B:B").Value) Then
        Rows("2:200").EntireRow.Hidden = True
    Else: Rows("2:200").EntireRow.Hidden = False
    End If
End Sub

Any suggestions?