[excel] Have Excel formulas that return 0, make the result blank

There is a very simple answer to this messy problem--the SUBSTITUTE function. In your example above:

=IF((1/1/INDEX(A,B,C))<>"",(1/1/INDEX(A,B,C)),"")

Can be rewritten as follows:

=SUBSTITUTE((1/1/INDEX(A,B,C), " ", "")