Formula Issue With Blank Cells

[hecgroups]

Hello Again,

I have a small issue with formula. I an calculating % for Increasing & Decreasing amount. Not the problem is if i leave the cell blank formula is not working. I have to enter cell value as 1 (One) in range F3:J10.

Want i want here is i want to leave the cells blank instead of returning the value as 1. Can any one help me please.

Sample file is attached.