SETBLANKLABEL can be used to replace blank row or column categories with custom text.
SETBLANKLABEL.<ROW/COLUMN>(VALUE)
VALUE - Pass the custom value to use instead of blank categories.
SETBLANKLABEL.ROW('row_label')
SETBLANKLABEL.COLUMN('col_label')
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SETBLANKLABEL function used in a variable
Notice how the blank row and column categories are replaced with the custom text "DESC". The buttons use the SETBLANKLABEL script internally.
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SETBLANKLABEL function in action