Hello everyone, 
I have a table chart showing the totals qta by month. 
the data is loaded by the function 

var grouped_data =google.visualization.data.group= (
dt, [0], 
        [{'column': 1, 'aggregation': google.visualization.data.sum, 
'type': 'number'}, / / gen 
        [{'column': 2, 'aggregation': google.visualization.data.sum, 
'type': 'number'}, / / feb 
... 
        ]); 

Often the amount per month is 0. 
I wish that instead of zero was shown the empty cell, for better 
readability. 
There is a special formatter, or another trick I can use? 

thanks

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