Conditional formatting - Blank Fields

[ahrrs]

Hi --

I am trying to create a RYG chart for my data that would allow me to see what programs are Red, Yellow, Green over the different months, however I am running into an issue with blank fields.  Since the data is over months, there are some that if the program hasn't started yet the field is blank. Due to the conditional formatting, all of the blank fields are automatically turning Red.  Is there a way to just leave the conditional formatting off of the blank cells.  

Thanks for any of the help!