How to check if a selected single-cell range (obtained from inputbox) has a blank value?

I have a bit of code where I ask the user to select a single cell. If that cell is empty, then, it should prompt the user to try again.

Does anyone know how to properly do something like this (as-is, this throws and application-defined or object-defined error):

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Thanks!

Something like this maybe ?

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As a VBA beginner starter :

PHP Code: 

        Dim Rg As Range, M$
    Do
        Set Rg = Nothing
        On Error Resume Next
        Set Rg = Application.InputBox(M & "Player 1, choose the next answer", Type:=8)
        On Error GoTo 0
        If Rg Is Nothing Then Exit Sub
        M = IIf(IsEmpty(Rg) Or Rg.Count > 1, "Same player shoot again !" & vbLf & vbLf, "")
    Loop Until M = "" 


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Thanks for the help all; this should really improve my Jeopardy game