microsoft excel - How do I hide the #DIV/0! error while a referenced cell is blank?

In Column C I have Production. In column D I have Goal. In Column E I have variance %. My formula is =(D11-C11)/D11

However, how do you hide the cells down the sheet until you put something in D11 & C11 to hide #DIV/0!. I have tried using the IF formula but seem to get it wrong?