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If you're using shapes/colors, then each value in column 'Significance' will need a shape/color -- even nulls will be assigned something. Two suggestions:
- Change the 'NOT SIG' shape to a custom image that is 1 pixel by 1 pixel (File:1x1.png - Wikimedia Commons). It will be so small as to perhaps not be noticeable.
- Assuming you're using the same field to determine color, set the color for 'NOT SIG' to be the same as the background color of the viz. If both are the same color, you won't see a shape present.
Hope this helps,