"No Stitch" on graph?

I’ve never tried graph knitting before so yeah, i’m probably smoking the good stuff… but I want to knit the “Tree of Life” afghan for my older brother (pattern found here: http://www.lionbrand.com/patterns/70122AD.html?noImages=0 )

What do I do with the “no stitch” squares in the graph pattern???

Ignore it. It’s not there. It’s the “gap in the map”. There is no stitch. You just skip the space [B][I]on the graph [/I][/B]and go to the next one.