Counting cells with colour fill, minus the cells with text

[Crappy]

Hi,

Ratehr new at this.
Have made a macro with the a function to count cells with different fill colours. the thing I need is to disregard the cells with the given colour that have text fill. Is that possible? Macro and Function below.

MACRO;

Function Countcolour(rng As Range, colour As Range) As Long
Dim c As Range
Application.Volatile
For Each c In rng
    If c.Interior.ColorIndex = colour.Interior.ColorIndex Then
        Countcolour = Countcolour + 1
    End If
Next
End Function

FUNCTION;

=(Countcolour($A$1:$AL$88;$B$43))-1

Any input would be valuable.

Thanks!