You can simply hide the "Include zero values" in the Complement tab on the graph (my sense is in portuguese, so the names are translated and might be a little different, but i've attached some images as examples bellow).
Heres my sample data i used:
Load * Inline
And two example images:
(with option marked, showing the label 2 in the dimension)
(without option marked, not showing the label 2 in the dimension)