#value

I have the following if statement: =IF((E10-D10)>=0,(E10-D10),"")
This formula means that if the subtraction of the 2 numbers is negative than it will be a blank cell. However, the cell E10 shows: "#VALUE!" because one of the cells it refers to in its formula doesn't have a number yet.
I want my IF statement to show a blank cell if E10 = "#VALUE!".
I hope this makes sense...

HELP!
Thanks