From what I understand, Conditional Formatting will only formats constants in the cells. Is there a way to format the results of an expression?

I am having a column calculate a running average, and then graph it on a separate sheet. I am using the NA() function to get the graph to only show the non-zero results. That works great for the graph. I would like though to not have the #N/A show up on the numerical page. I have tried formatting it to the same color as the background with no luck.

How would I go about this? Thanks for your help in advance.