Use the SHOWZEROAS function to customize how to display zeroes in your reports.
TYPE- Can be BLANK, HYPHEN, CUSTOM, or ZERO. Pass the custom value to use when the TYPE is 'CUSTOM'.
SHOWZEROAS.BLANK
SHOWZEROAS.ZERO
SHOWZEROAS.HYPHEN
SHOWZEROAS.CUSTOM('custom text')
The zero values in the report have been updated to custom identifiers with the SHOWZEROAS script.