I have the following formulas:

Down column B:
=SUMPRODUCT(--(MONTH(MAIN!$A$10:$A$4999)=MONTH($G$1)),--(DAY(MAIN!$A$10:$A$4999)=DAY($A1)),MAIN!$D$10:$D$4 999)

Down column C: C1 =B1 then C2 onwards =SUM(C1+B2)

How do I get both columns to show an empty cell if the figure is zero?
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WH99