Showing blank field within pivot table

Hello all,
I have a question concerning pivot tables. I had a pivot table that I would refresh monthly. It would show all of the months for the entire year, but there would only be values within the months that had data. I was originally pulling the values from a calculation I was doing within the data file. Recently my boss went in and changed the pivot table to perform the percentage calculation in the pivot table rather than grabbing the value from the data source. Now, I have #DIV/0 for the months of Oct-Dec, because there aren't any values for those months within my data tab. Does anyone know how I can keep the formula within the pivot, and still be able to show the full year without having Oct-Dec show #DIV/0? I have attached an example of the pivots to show you what I am talking about. Thanks for any and all help!

Damian37